@article{pasatembou2023progress,
      title={Progress towards ultracold Sr for the AION project -- sub-microkelvin atoms and an optical-heterodyne diagnostic tool for injection-locked laser diodes}, 
      author={E. Pasatembou and C. F. A. Baynham and O. Buchmüller and D. Evans and R. Hobson and L. Iannizzotto-Venezze and A. Josset},
      year={2023},
      month={10},
      eprint={2310.08500},
      archivePrefix={arXiv},
      primaryClass={physics.atom-ph},
      journal={ArXiV},
      doi={10.48550/arXiv.2310.08500},
      url={https://doi.org/10.48550/arXiv.2310.08500},
      abstract={Long-baseline atom interferometers, such as the one to be built by the AION collaboration, require ultra-cold atomic clouds. These are produced by trapping the atoms in Magneto-Optical Traps (MOTs) using high-power, narrow-linewidth lasers. We report on the laser and optical master-slave injection locked system used to address the 1S0 - 3P1 strontium transition at 689 nm, and on the trapping of strontium atoms in a narrowband MOT. We demonstrate the quality of the injection through the characterisation of the injection lock using a novel, easy-to-assemble method which uses a double pass acousto-optic modulator (AOM) to generate and detect a heterodyne beatnote. The reported system is used to produce an atomic cloud at a temperature of 812 +/- 43 nK in a narrowband red MOT. },
}

@article{abend2023terrestrial,
      title={Terrestrial Very-Long-Baseline Atom Interferometry: Workshop Summary}, 
      author={Sven Abend and Baptiste Allard and Iván Alonso and John Antoniadis and Henrique Araujo and Gianluigi Arduini and Aidan Arnold and Tobias Aßmann and Nadja Augst and Leonardo Badurina and Antun Balaz and Hannah Banks and Michele Barone and Michele Barsanti and Angelo Bassi and Baptiste Battelier and Charles Baynham and Beaufils Quentin and Aleksandar Belic and Ankit Beniwal and Jose Bernabeu and Francesco Bertinelli and Andrea Bertoldi and Ikbal Ahamed Biswas and Diego Blas and Patrick Boegel and Aleksandar Bogojevic and Jonas Böhm and Samuel Böhringer and Kai Bongs and Philippe Bouyer and Christian Brand and Apostolos Brimis and Oliver Buchmueller and Luigi Cacciapuoti and Sergio Calatroni and Benjamin Canuel and Chiara Caprini and Ana Caramete and Laurentiu Caramete and Matteo Carlesso and John Carlton and Mateo Casariego and Vassilis Charmandaris and Yu-Ao Chen and Maria Luisa Chiofalo and Alessia Cimbri and Jonathon Coleman and Florin Lucian Constantin and Carlo Contaldi and Yanou Cui and Elisa Da Ros and Gavin Davies and Esther del Pino Rosendo and Christian Deppner and Andrei Derevianko and Claudia de Rham and Albert De Roeck and Daniel Derr and Fabio Di Pumpo and Goran Djordjevic and Babette Dobrich and Peter Domokos and Peter Dornan and Michael Doser and Giannis Drougakis and Jacob Dunningham and Alisher Duspayev and Sajan Easo and Joshua Eby and Maxim Efremov and Tord Ekelof and Gedminas Elertas and John Ellis and David Evans and Pavel Fadeev and Mattia Fanì and Farida Fassi and Marco Fattori and Pierre Fayet and Daniel Felea and Jie Feng and Alexander Friedrich and Elina Fuchs and Naceur Gaaloul and Dongfeng Gao and Susan Gardner and Barry Garraway and Alexandre Gauguet and Sandra Gerlach and Matthias Gersemann and Valerie Gibson and Enno Giese and Gian Francesco Giudice and Eric Glasbrenner and Mustafa Gündogan and Martin G. Haehnelt and Timo Hakulinen and Klemens Hammerer and Ekim Taylan Hanımeli and Tiffany Harte and Leonie Hawkins and Aurelien Hees and Jaret Heise and Victoria Henderson and Sven Herrmann and Thomas Hird and Jason Hogan and Bodil Holst and Michael Holynski and Kamran Hussain and Gregor Janson and Peter Jeglič and Fedor Jelezko and Michael Kagan and Matti Kalliokoski and Mark Kasevich and Alex Kehagias and Eva Kilian and Soumen Koley and Bernd Konrad and Joachim Kopp and Georgy Kornakov and Tim Kovachy and Markus Krutzik and Mukesh Kumar and Pradeep Kumar and Claus Laemmerzahl and Greg Landsberg and Mehdi Langlois and Bryony Lanigan and Samuel Lellouch and Bruno Leone and Christophe Le Poncin Lafitte and Marek Lewicki and Bastian Leykauf and Ali Lezeik and Lucas Lombriser and Luis López and Elias López Asamar and Cristian López Monjaraz and Gaetano Luciano and Mohammed Mahmoud Mohammed and Azadeh Maleknejad and Krutzik Markus and Jacques Marteau and Didier Massonnet and Anupam Mazumdar and Christopher McCabe and Matthias Meister and Jonathan Menu and Giuseppe Messineo and Salvatore Micalizio and Peter Millington and Milan Milosevic and Jeremiah Mitchell and Mario Montero and Gavin Morley and Jürgen Müller and Özgür Müstecaplıoğlu and Wei-Tou Ni and Johannes Noller and Senad Odžak and Daniel Oi and Yasser Omar and Julia Pahl and Sean Paling and Saurabh Pandey and George Pappas and Vinay Pareek and Elizabeth Pasatembou and Emanuele Pelucchi and Franck Pereira dos Santos and Baptist Piest and Igor Pikovski and Apostolos Pilaftsis and Robert Plunkett and Rosa Poggiani and Marco Prevedelli and Julia Puputti and Vishnupriya Puthiya Veettil and John Quenby and Johann Rafelski and Surjeet Rajendran and Ernst Maria Rasel and Haifa Rejeb Sfar and Serge Reynaud and Andrea Richaud and Tangui Rodzinka and Albert Roura and Jan Rudolph and Dylan Sabulsky and Marianna Safronova and Luigi Santamaria and Manuel Schilling and Vladimir Schkolnik and Wolfgang Schleich and Dennis Schlippert and Ulrich Schneider and Florian Schreck and Christian Schubert and Nico Schwersenz and Aleksei Semakin and Olga Sergijenko and Lijing Shao and Ian Shipsey and Rajeev Singh and Augusto Smerzi and Carlos F. Sopuerta and Alessandro Spallicci and Petruta Stefanescu and Nikolaos Stergioulas and Jannik Ströhle and Christian Struckmann and Silvia Tentindo and Henry Throssell and Guglielmo M. Tino and Jonathan Tinsley and Ovidiu Tintareanu Mircea and Kimberly Tkalčec and Andrew Tolley and Vincenza Tornatore and Alejandro Torres-Orjuela and Philipp Treutlein and Andrea Trombettoni and Yu-Dai Tsai and Christian Ufrecht and Stefan Ulmer and Daniel Valuch and Ville Vaskonen and Veronica Vazquez Aceves and Nikolay Vitanov and Christian Vogt and Wolf von Klitzing and András Vukics and Reinhold Walser and Jin Wang and Niels Warburton and Alexander Webber-Date and André Wenzlawski and Michael Werner and Jason Williams and Patrcik Windapssinger and Peter Wolf and Lisa Wörner and André Xuereb and Mohamed Yahia and Emmanuel Zambrini Cruzeiro and Moslem Zarei and Mingsheng Zhan and Lin Zhou and Jure Zupan and Erik Zupanič},
      year={2023},
      month={10},
      eprint={2310.08183},
      archivePrefix={arXiv},
      primaryClass={hep-ex},
      journal={ArXiV},
      doi={10.48550/arXiv.2310.08183},
      url={https://doi.org/10.48550/arXiv.2310.08183},
      abstract={This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around the world to discuss the exciting developments in large-scale atom interferometer (AI) prototypes and their potential for detecting ultralight dark matter and gravitational waves. The primary objective of the workshop was to lay the groundwork for an international TVLBAI proto-collaboration. This collaboration aims to unite researchers from different institutions to strategize and secure funding for terrestrial large-scale AI projects. The ultimate goal is to create a roadmap detailing the design and technology choices for one or more km-scale detectors, which will be operational in the mid-2030s. The key sections of this report present the physics case and technical challenges, together with a comprehensive overview of the discussions at the workshop together with the main conclusions.},
}

@article{stray2023centralised,
      title={Centralised Design and Production of the Ultra-High Vacuum and Laser-Stabilisation Systems for the AION Ultra-Cold Strontium Laboratories}, 
      author={B. Stray and O. Ennis and S. Hedges and S. Dey and M. Langlois and K. Bongs and S. Lellouch and M. Holynski and B. Bostwick and J. Chen and Z. Eyler and V. Gibson and T. L. Harte and M. Hsu and M. Karzazi and J. Mitchell and N. Mouelle and U. Schneider and Y. Tang and K. Tkalcec and Y. Zhi and K. Clarke and A. Vick and K. Bridges and J. Coleman and G. Elertas and L. Hawkins and S. Hindley and K. Hussain and C. Metelko and H. Throssell and C. F. A. Baynham and O. Buchmuller and D. Evans and R. Hobson and L. Iannizzotto-Venezze and A. Josset and E. Pasatembou and B. E. Sauer and M. R. Tarbutt and L Badurina and A. Beniwal and D. Blas and J. Carlton and J. Ellis and C. McCabe and E. Bentine and M. Booth and D. Bortoletto and C. Foot and C. Gomez and T. Hird and K. Hughes and A. James and A. Lowe and J. March-Russell and J. Schelfhout and I. Shipsey and D. Weatherill and D. Wood and S. Balashov and M. G. Bason and J. Boehm and M. Courthold and M. van der Grinten and P. Majewski and A. L. Marchant and D. Newbold and Z. Pan and Z. Tam and T. Valenzuela and I. Wilmut},
      abstract={This paper outlines the centralised design and production of the Ultra-High-Vacuum sidearm and Laser-Stabilisation systems for the AION Ultra-Cold Strontium Laboratories. Commissioning data on the residual gas and steady-state pressures in the sidearm chambers, on magnetic field quality, on laser stabilisation, and on the loading rate for the 3D Magneto-Optical Trap are presented. Streamlining the design and production of the sidearm and laser stabilisation systems enabled the AION Collaboration to build and equip in parallel five state-of-the-art Ultra-Cold Strontium Laboratories within 24 months by leveraging key expertise in the collaboration. This approach could serve as a model for the development and construction of other cold atom experiments, such as atomic clock experiments and neutral atom quantum computing systems, by establishing dedicated design and production units at national laboratories.},
      year={2023},
      month={5},
      eprint={2305.20060},
      archivePrefix={arXiv},
      primaryClass={physics.atom-ph},
      journal={ArXiV},
      doi={10.48550/arXiv.2305.20060},
      url={https://doi.org/10.48550/arXiv.2305.20060},
}


@article{Sherrill_2023,
doi = {10.1088/1367-2630/aceff6},
url = {https://dx.doi.org/10.1088/1367-2630/aceff6},
year = {2023},
month = {9},
publisher = {IOP Publishing},
volume = {25},
number = {9},
pages = {093012},
author = {Nathaniel Sherrill and Adam O Parsons and Charles F A Baynham and William Bowden and E Anne Curtis and Richard Hendricks and Ian R Hill and Richard Hobson and Helen S Margolis and Billy I Robertson and Marco Schioppo and Krzysztof Szymaniec and Alexandra Tofful and Jacob Tunesi and Rachel M Godun and Xavier Calmet},
title = {Analysis of atomic-clock data to constrain variations of fundamental constants},
journal = {New Journal of Physics},
abstract = {We present a new framework to study the time variation of fundamental constants in a model-independent way. Model independence implies more free parameters than assumed in previous studies. Using data from atomic clocks based on 87Sr, 171Yb+ and 133Cs, we set bounds on parameters controlling the variation of the fine-structure constant, α, and the electron-to-proton mass ratio, µ. We consider variations on timescales ranging from a minute to almost a day. In addition, we use our results to derive some of the tightest limits to date on the parameter space of models of ultralight dark matter and axion-like particles.}
}

@article{Schioppo2022,
   abstract = {Ultrastable lasers are essential tools in optical frequency metrology enabling unprecedented measurement precision that impacts on fields such as atomic timekeeping, tests of fundamental physics, and geodesy. To characterise an ultrastable laser it needs to be compared with a laser of similar performance, but a suitable system may not be available locally. Here, we report a comparison of two geographically separated lasers, over the longest ever reported metrological optical fibre link network, measuring 2220 km in length, at a state-of-the-art fractional-frequency instability of 7 × 10−17 for averaging times between 30 s and 200 s. The measurements also allow the short-term instability of the complete optical fibre link network to be directly observed without using a loop-back fibre. Based on the characterisation of the noise in the lasers and optical fibre link network over different timescales, we investigate the potential for disseminating ultrastable light to improve the performance of remote optical clocks.},
   author = {M. Schioppo and J. Kronjäger and A. Silva and R. Ilieva and J. W. Paterson and C. F.A. Baynham and W. Bowden and I. R. Hill and R. Hobson and A. Vianello and M. Dovale-Álvarez and R. A. Williams and G. Marra and H. S. Margolis and A. Amy-Klein and O. Lopez and E. Cantin and H. Álvarez-Martínez and R. Le Targat and P. E. Pottie and N. Quintin and T. Legero and S. Häfner and U. Sterr and R. Schwarz and S. Dörscher and C. Lisdat and S. Koke and A. Kuhl and T. Waterholter and E. Benkler and G. Grosche},
   doi = {10.1038/s41467-021-27884-3},
   issn = {20411723},
   issue = {1},
   journal = {Nature Communications},
   keywords = {Fibre optics and optical communications,Fluorescence spectroscopy,Optical metrology,Optical sensors,Seismology},
   month = {1},
   pmid = {35017500},
   publisher = {Nature Publishing Group},
   title = {Comparing ultrastable lasers at 7 × 10−17 fractional frequency instability through a 2220 km optical fibre network},
   volume = {13},
   url = {https://www.nature.com/articles/s41467-021-27884-3},
   year = {2022},
}



@article{space2022roadmap,
title = "Cold atoms in space: community workshop summary and proposed road-map",
abstract = "We summarise the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportunities offered by their deployment in space, and the developments needed before cold atoms could be operated in space. The cold atom technologies discussed include atomic clocks, quantum gravimeters and accelerometers, and atom interferometers. Prospective applications include metrology, geodesy and measurement of terrestrial mass change due to, e.g., climate change, and fundamental science experiments such as tests of the equivalence principle, searches for dark matter, measurements of gravitational waves and tests of quantum mechanics. We review the current status of cold atom technologies and outline the requirements for their space qualification, including the development paths and the corresponding technical milestones, and identifying possible pathfinder missions to pave the way for missions to exploit the full potential of cold atoms in space. Finally, we present a first draft of a possible road-map for achieving these goals, that we propose for discussion by the interested cold atom, Earth Observation, fundamental physics and other prospective scientific user communities, together with the European Space Agency (ESA) and national space and research funding agencies.",
author={Alonso, Iván and Alpigiani, Cristiano and Altschul, Brett and Araújo, Henrique and Arduini, Gianluigi and Arlt, Jan and Badurina, Leonardo and Balaž, Antun and Bandarupally, Satvika and Barish, Barry C. and Barone, Michele and Barsanti, Michele and Bass, Steven and Bassi, Angelo and Battelier, Baptiste and Baynham, Charles F. A. and Beaufils, Quentin and Belić, Aleksandar and Bergé, Joel and Bernabeu, Jose and Bertoldi, Andrea and Bingham, Robert and Bize, Sébastien and Blas, Diego and Bongs, Kai and Bouyer, Philippe and Braitenberg, Carla and Brand, Christian and Braxmaier, Claus and Bresson, Alexandre and Buchmueller, Oliver and Budker, Dmitry and Bugalho, Luís and Burdin, Sergey and Cacciapuoti, Luigi and Callegari, Simone and Calmet, Xavier and Calonico, Davide and Canuel, Benjamin and Caramete, Laurentiu-Ioan and Carraz, Olivier and Cassettari, Donatella and Chakraborty, Pratik and Chattopadhyay, Swapan and Chauhan, Upasna and Chen, Xuzong and Chen, Yu-Ao and Chiofalo, Maria Luisa and Coleman, Jonathon and Corgier, Robin and Cotter, J. P. and Michael Cruise, A. and Cui, Yanou and Davies, Gavin and De Roeck, Albert and Demarteau, Marcel and Derevianko, Andrei and Di Clemente, Marco and Djordjevic, Goran S. and Donadi, Sandro and Doré, Olivier and Dornan, Peter and Doser, Michael and Drougakis, Giannis and Dunningham, Jacob and Easo, Sajan and Eby, Joshua and Elertas, Gedminas and Ellis, John and Evans, David and Examilioti, Pandora and Fadeev, Pavel and Fanì, Mattia and Fassi, Farida and Fattori, Marco and Fedderke, Michael A. and Felea, Daniel and Feng, Chen-Hao and Ferreras, Jorge and Flack, Robert and Flambaum, Victor V. and Forsberg, René and Fromhold, Mark and Gaaloul, Naceur and Garraway, Barry M. and Georgousi, Maria and Geraci, Andrew and Gibble, Kurt and Gibson, Valerie and Gill, Patrick and Giudice, Gian F. and Goldwin, Jon and Gould, Oliver and Grachov, Oleg and Graham, Peter W. and Grasso, Dario and Griffin, Paul F. and Guerlin, Christine and Gündoğan, Mustafa and Gupta, Ratnesh K. and Haehnelt, Martin and Hanımeli, Ekim T. and Hawkins, Leonie and Hees, Aurélien and Henderson, Victoria A. and Herr, Waldemar and Herrmann, Sven and Hird, Thomas and Hobson, Richard and Hock, Vincent and Hogan, Jason M. and Holst, Bodil and Holynski, Michael and Israelsson, Ulf and Jeglič, Peter and Jetzer, Philippe and Juzeliūnas, Gediminas and Kaltenbaek, Rainer and Kamenik, Jernej F. and Kehagias, Alex and Kirova, Teodora and Kiss-Toth, Marton and Koke, Sebastian and Kolkowitz, Shimon and Kornakov, Georgy and Kovachy, Tim and Krutzik, Markus and Kumar, Mukesh and Kumar, Pradeep and Lämmerzahl, Claus and Landsberg, Greg and Le Poncin-Lafitte, Christophe and Leibrandt, David R. and Lévèque, Thomas and Lewicki, Marek and Li, Rui and Lipniacka, Anna and Lisdat, Christian and Liu, Mia and Lopez-Gonzalez, J. L. and Loriani, Sina and Louko, Jorma and Luciano, Giuseppe Gaetano and Lundblad, Nathan and Maddox, Steve and Mahmoud, M. A. and Maleknejad, Azadeh and March-Russell, John and Massonnet, Didier and McCabe, Christopher and Meister, Matthias and Mežnaršič, Tadej and Micalizio, Salvatore and Migliaccio, Federica and Millington, Peter and Milosevic, Milan and Mitchell, Jeremiah and Morley, Gavin W. and Müller, Jürgen and Murphy, Eamonn and Müstecaplıoğlu, Özgür E. and O’Shea, Val and Oi, Daniel K. L. and Olson, Judith and Pal, Debapriya and Papazoglou, Dimitris G. and Pasatembou, Elizabeth and Paternostro, Mauro and Pawlowski, Krzysztof and Pelucchi, Emanuele and Pereira dos Santos, Franck and Peters, Achim and Pikovski, Igor and Pilaftsis, Apostolos and Pinto, Alexandra and Prevedelli, Marco and Puthiya-Veettil, Vishnupriya and Quenby, John and Rafelski, Johann and Rasel, Ernst M. and Ravensbergen, Cornelis and Reguzzoni, Mirko and Richaud, Andrea and Riou, Isabelle and Rothacher, Markus and Roura, Albert and Ruschhaupt, Andreas and Sabulsky, Dylan O. and Safronova, Marianna and Saltas, Ippocratis D. and Salvi, Leonardo and Sameed, Muhammed and Saurabh, Pandey and Schäffer, Stefan and Schiller, Stephan and Schilling, Manuel and Schkolnik, Vladimir and Schlippert, Dennis and Schmidt, Piet O. and Schnatz, Harald and Schneider, Jean and Schneider, Ulrich and Schreck, Florian and Schubert, Christian and Shayeghi, Armin and Sherrill, Nathaniel and Shipsey, Ian and Signorini, Carla and Singh, Rajeev and Singh, Yeshpal and Skordis, Constantinos and Smerzi, Augusto and Sopuerta, Carlos F. and Sorrentino, Fiodor and Sphicas, Paraskevas and Stadnik, Yevgeny V. and Stefanescu, Petruta and Tarallo, Marco G. and Tentindo, Silvia and Tino, Guglielmo M. and Tinsley, Jonathan N. and Tornatore, Vincenza and Treutlein, Philipp and Trombettoni, Andrea and Tsai, Yu-Dai and Tuckey, Philip and Uchida, Melissa A. and Valenzuela, Tristan and Van Den Bossche, Mathias and Vaskonen, Ville and Verma, Gunjan and Vetrano, Flavio and Vogt, Christian and von Klitzing, Wolf and Waller, Pierre and Walser, Reinhold and Wille, Eric and Williams, Jason and Windpassinger, Patrick and Wittrock, Ulrich and Wolf, Peter and Woltmann, Marian and Wörner, Lisa and Xuereb, André and Yahia, Mohamed and Yazgan, Efe and Yu, Nan and Zahzam, Nassim and Zambrini Cruzeiro, Emmanuel and Zhan, Mingsheng and Zou, Xinhao and Zupan, Jure and Zupanič, Erik},
year = "2022",
month = {12},
doi = "10.1140/epjqt/s40507-022-00147-w",
language = "English (US)",
volume = "9",
journal = "EPJ Quantum Technology",
issn = "2662-4400",
publisher = "SpringerOpen",
number = "1",
url = {https://doi.org/10.1140/epjqt/s40507-022-00147-w},
}


@article{El-Neaj2020,
abstract = {We propose in this White Paper a concept for a space experiment using cold atoms to search for ultra-light dark matter, and to detect gravitational waves in the frequency range between the most sensitive ranges of LISA and the terrestrial LIGO/Virgo/KAGRA/INDIGO experiments. This interdisciplinary experiment, called Atomic Experiment for Dark Matter and Gravity Exploration (AEDGE), will also complement other planned searches for dark matter, and exploit synergies with other gravitational wave detectors. We give examples of the extended range of sensitivity to ultra-light dark matter offered by AEDGE, and how its gravitational-wave measurements could explore the assembly of super-massive black holes, first-order phase transitions in the early universe and cosmic strings. AEDGE will be based upon technologies now being developed for terrestrial experiments using cold atoms, and will benefit from the space experience obtained with, e.g., LISA and cold atom experiments in microgravity. KCL-PH-TH/2019-65, CERN-TH-2019-126.},
archivePrefix = {arXiv},
arxivId = {1908.00802},
author = {El-Neaj, Yousef Abou and Alpigiani, Cristiano and Amairi-Pyka, Sana and Ara{\'{u}}jo, Henrique and Bala{\v{z}}, Antun and Bassi, Angelo and Bathe-Peters, Lars and Battelier, Baptiste and Beli{\'{c}}, Aleksandar and Bentine, Elliot and Bernabeu, Jos{\'{e}} and Bertoldi, Andrea and Bingham, Robert and Blas, Diego and Bolpasi, Vasiliki and Bongs, Kai and Bose, Sougato and Bouyer, Philippe and Bowcock, Themis and Bowden, William and Buchmueller, Oliver and Burrage, Clare and Calmet, Xavier and Canuel, Benjamin and Caramete, Laurentiu Ioan and Carroll, Andrew and Cella, Giancarlo and Charmandaris, Vassilis and Chattopadhyay, Swapan and Chen, Xuzong and Chiofalo, Maria Luisa and Coleman, Jonathon and Cotter, Joseph and Cui, Yanou and Derevianko, Andrei and {De Roeck}, Albert and Djordjevic, Goran S. and Dornan, Peter and Doser, Michael and Drougkakis, Ioannis and Dunningham, Jacob and Dutan, Ioana and Easo, Sajan and Elertas, Gedminas and Ellis, John and {El Sawy}, Mai and Fassi, Farida and Felea, Daniel and Feng, Chen Hao and Flack, Robert and Foot, Chris and Fuentes, Ivette and Gaaloul, Naceur and Gauguet, Alexandre and Geiger, Remi and Gibson, Valerie and Giudice, Gian and Goldwin, Jon and Grachov, Oleg and Graham, Peter W. and Grasso, Dario and van der Grinten, Maurits and G{{u}}ndogan, Mustafa and Haehnelt, Martin G. and Harte, Tiffany and Hees, Aur{\'{e}}lien and Hobson, Richard and Hogan, Jason and Holst, Bodil and Holynski, Michael and Kasevich, Mark and Kavanagh, Bradley J. and von Klitzing, Wolf and Kovachy, Tim and Krikler, Benjamin and Krutzik, Markus and Lewicki, Marek and Lien, Yu Hung and Liu, Miaoyuan and Luciano, Giuseppe Gaetano and Magnon, Alain and Mahmoud, Mohammed Attia and Malik, Sarah and McCabe, Christopher and Mitchell, Jeremiah and Pahl, Julia and Pal, Debapriya and Pandey, Saurabh and Papazoglou, Dimitris and Paternostro, Mauro and Penning, Bjoern and Peters, Achim and Prevedelli, Marco and Puthiya-Veettil, Vishnupriya and Quenby, John and Rasel, Ernst and Ravenhall, Sean and Ringwood, Jack and Roura, Albert and Sabulsky, Dylan and Sameed, Muhammed and Sauer, Ben and Sch{{a}}ffer, Stefan Alaric and Schiller, Stephan and Schkolnik, Vladimir and Schlippert, Dennis and Schubert, Christian and Sfar, Haifa Rejeb and Shayeghi, Armin and Shipsey, Ian and Signorini, Carla and Singh, Yeshpal and Soares-Santos, Marcelle and Sorrentino, Fiodor and Sumner, Timothy and Tassis, Konstantinos and Tentindo, Silvia and Tino, Guglielmo Maria and Tinsley, Jonathan N. and Unwin, James and Valenzuela, Tristan and Vasilakis, Georgios and Vaskonen, Ville and Vogt, Christian and Webber-Date, Alex and Wenzlawski, Andr{\'{e}} and Windpassinger, Patrick and Woltmann, Marian and Yazgan, Efe and Zhan, Ming Sheng and Zou, Xinhao and Zupan, Jure},
doi = {10.1140/epjqt/s40507-020-0080-0},
eprint = {1908.00802},
issn = {21960763},
journal = {EPJ Quantum Technology},
number = {1},
title = {{AEDGE: Atomic Experiment for Dark Matter and Gravity Exploration in Space}},
volume = {7},
year = {2020},
month = {3},
url = {https://doi.org/10.1140/epjqt/s40507-020-0080-0},
}

@article{Roberts_2020,
doi = {10.1088/1367-2630/abaace},
url = {https://dx.doi.org/10.1088/1367-2630/abaace},
year = {2020},
month = {9},
publisher = {IOP Publishing},
volume = {22},
number = {9},
pages = {093010},
author = {B M Roberts and P Delva and A Al-Masoudi and A Amy-Klein and C Bærentsen and C F A Baynham and E Benkler and S Bilicki and S Bize and W Bowden and J Calvert and V Cambier and E Cantin and E A Curtis and S Dörscher and M Favier and F Frank and P Gill and R M Godun and G Grosche and C Guo and A Hees and I R Hill and R Hobson and N Huntemann and J Kronjäger and S Koke and A Kuhl and R Lange and T Legero and B Lipphardt and C Lisdat and J Lodewyck and O Lopez and H S Margolis and H Álvarez-Martínez and F Meynadier and F Ozimek and E Peik and P-E Pottie and N Quintin and C Sanner and L De Sarlo and M Schioppo and R Schwarz and A Silva and U Sterr and Chr Tamm and R Le Targat and P Tuckey and G Vallet and T Waterholter and D Xu and P Wolf},
title = {Search for transient variations of the fine structure constant and dark matter using fiber-linked optical atomic clocks},
journal = {New Journal of Physics},
abstract = {We search for transient variations of the fine structure constant using data from a European network of fiber-linked optical atomic clocks. By searching for coherent variations in the recorded clock frequency comparisons across the network, we significantly improve the constraints on transient variations of the fine structure constant. For example, we constrain the variation to |δα/α| < 5 × 10−17 for transients of duration 103 s. This analysis also presents a possibility to search for dark matter, the mysterious substance hypothesised to explain galaxy dynamics and other astrophysical phenomena that is thought to dominate the matter density of the universe. At the current sensitivity level, we find no evidence for dark matter in the form of topological defects (or, more generally, any macroscopic objects), and we thus place constraints on certain potential couplings between the dark matter and standard model particles, substantially improving upon the existing constraints, particularly for large (≳104 km) objects.}
}

@article{Riedel_2020,
doi = {10.1088/1681-7575/ab6745},
url = {https://dx.doi.org/10.1088/1681-7575/ab6745},
year = {2020},
month = {7},
publisher = {IOP Publishing},
volume = {57},
number = {4},
pages = {045005},
author = {F Riedel and A Al-Masoudi and E Benkler and S Dörscher and V Gerginov and C Grebing and S Häfner and N Huntemann and B Lipphardt and C Lisdat and E Peik and D Piester and C Sanner and C Tamm and S Weyers and H Denker and L Timmen and C Voigt and D Calonico and G Cerretto and G A Costanzo and F Levi and I Sesia and J Achkar and J Guéna and M Abgrall and D Rovera and B Chupin and C Shi and S Bilicki and E Bookjans and J Lodewyck and R Le Targat and P Delva and S Bize and F N Baynes and C F A Baynham and W Bowden and P Gill and R M Godun and I R Hill and R Hobson and J M Jones and S A King and P B R Nisbet-Jones and A Rolland and S L Shemar and P B Whibberley and H S Margolis},
title = {Direct comparisons of European primary and secondary frequency standards via satellite techniques},
journal = {Metrologia},
abstract = {We carried out a 26-day comparison of five simultaneously operated optical clocks and six atomic fountain clocks located at INRIM, LNE-SYRTE, NPL and PTB by using two satellite-based frequency comparison techniques: broadband Two-Way Satellite Time and Frequency Transfer (TWSTFT) and Global Positioning System Precise Point Positioning (GPS PPP). With an enhanced statistical analysis procedure taking into account correlations and gaps in the measurement data, combined overall uncertainties in the range of 1.8 × 10−16 to 3.5 × 10−16 for the optical clock comparisons were found. The comparison of the fountain clocks yields results with a maximum relative frequency difference of 6.9 × 10−16, and combined overall uncertainties in the range of 4.8 × 10−16 to 7.7 × 10−16.}
}


@article{Badurina2019,
abstract = {We outline the experimental concept and key scientific capabilities of AION (Atom Interferometer Observatory and Network), a proposed experimental programme using cold strontium atoms to search for ultra-light dark matter, to explore gravitational waves in the mid-frequency range between the peak sensitivities of the LISA and LIGO/Virgo/ KAGRA/INDIGO/Einstein Telescope/Cosmic Explorer experiments, and to probe other frontiers in fundamental physics. AION would complement other planned searches for dark matter, as well as probe mergers involving intermediate-mass black holes and explore early-universe cosmology. AION would share many technical features with the MAGIS experimental programme, and synergies would flow from operating AION in a network with this experiment, as well as with other atom interferometer experiments such as MIGA, ZAIGA and ELGAR. Operating AION in a network with other gravitational wave detectors such as LIGO, Virgo and LISA would also offer many synergies.},
archivePrefix = {arXiv},
arxivId = {1911.11755},
author = {Badurina, L. and Bentine, E. and Blas, D. and Bongs, K. and Bortoletto, D. and Bowcock, T. and Bridges, K. and Bowden, W. and Buchmueller, O. and Burrage, C. and Coleman, J. and Elertas, G. and Ellis, J. and Foot, C. and Gibson, V. and Haehnelt, M. G. and Harte, T. and Hedges, S. and Hobson, R. and Holynski, M. and Jones, T. and Langlois, M. and Lellouch, S. and Lewicki, M. and Maiolino, R. and Majewski, P. and Malik, S. and March-Russell, J. and McCabe, C. and Newbold, D. and Sauer, B. and Schneider, U. and Shipsey, I. and Singh, Y. and Uchida, M. A. and Valenzuela, T. and {Van Der Grinten}, M. and Vaskonen, V. and Vossebeld, J. and Weatherill, D. and Wilmut, I.},
doi = {10.1088/1475-7516/2020/05/011},
eprint = {1911.11755},
issn = {14757516},
journal = {Journal of Cosmology and Astroparticle Physics},
keywords = {dark matter experiments,gravitational waves / experiments,particle physics - cosmology connection,physics of the early universe},
number = {5},
title = {{AION: An atom interferometer observatory and network}},
volume = {2020},
year = {2020},
month = {5},
url = {https://doi.org/10.1088/1475-7516/2020/05/011},
}


@article{Hobson_2020,
doi = {10.1088/1681-7575/abb530},
url = {https://dx.doi.org/10.1088/1681-7575/abb530},
year = {2020},
month = {10},
publisher = {IOP Publishing},
volume = {57},
number = {6},
pages = {065026},
author = {Richard Hobson and William Bowden and Alvise Vianello and Alissa Silva and Charles F A Baynham and Helen S Margolis and Patrick E G Baird and Patrick Gill and Ian R Hill},
title = {A strontium optical lattice clock with 1 × 10−17 uncertainty and measurement of its absolute frequency},
journal = {Metrologia},
abstract = {We present a measurement of the absolute frequency of the 5 s2 1S0 to 5s5p 3P0 transition in 87Sr which is a secondary representation of the SI second. We describe the optical lattice clock apparatus used for the measurement, and we focus in detail on how its systematic frequency shifts are evaluated with a total fractional uncertainty of 1 × 10−17. Traceability to the International System of Units is provided via comparison to International Atomic Time (TAI). Gathering data over 5- and 15-day periods, with the lattice clock operating on average 74% of the time, we measure the frequency of the transition to be 429 228 004 229 873.1 (5) Hz, which corresponds to a fractional uncertainty of 1 × 10−15. We describe in detail how this uncertainty arises from the intermediate steps linking the optical frequency standard, through our local time scale UTC(NPL), to an ensemble of primary and secondary frequency standards which steer TAI. The calculated absolute frequency of the transition is in good agreement with recent measurements carried out in other laboratories around the world.}
}