Terrestrial Very-Long-Baseline Atom Interferometry: Summary of the second workshop
A. Abdalla, M. Abe, S. Abend, M. Abidi, M. Aidelsburger, A. Alibabaei, B. Allard, J. Antoniadis, G. Arduini, N. Augst, P. Balamatsias, A. Balae, H. Banks, R.L. Barcklay, M. Barone, M. Barsanti, M.G. Bason, A. Bassi, J.B. Bayle, C.F.A. Baynham, Q. Beaufils, S. Beldjoudi, A. Beli, S. Bennetts, J. Bernabeu, A. Bertoldi, C. Bigard, N.P. Bigelow, R. Bingham, D. Blas, A. Bobrick, S. Boehringer, A. Bogojevi, K. Bongs, D. Bortoletto, P. Bouyer, C. Brand, O. Buchmueller, G. Buica, S. Calatroni, L. Calmels, P. Canizares, B. Canuel, A. Caramete, L.I. Caramete, M. Carlesso, J. Carlton, S.P. Carman, A. Carroll, M. Casariego, M. Chairetis, V. Charmandaris, U. Chauhan, J. Chen, M.L.M.L.M. Chiofalo, D. Ciampini, A. Cimbri, P. Cladé, J. Coleman, F.L. Constantin, C.R. Contaldi, R. Corgier, B. Dash, G.J. Davies, C. De Rham, A. De Roeck, D. Derr, S. Dey, F. Di Pumpo, G.S. Djordjevic, B. Döbrich, P. Dornan, M. Doser, G. Drougakis, J. Dunningham, A. Duspayev, S. Easo, J. Eby, M. Efremov, G. Elertas, J. Ellis, N. Entin, S. Fairhurst, M. Fanì, F. Fassi, P. Fayet, D. Felea, J. Feng, R. Flack, C. Foot, T. Freegarde, E. Fuchs, N. Gaaloul, D. Gao, S. Gardner, B.M. Garraway, C.L. Garrido Alzar, A. Gauguet, E. Giese, P. Gill, G.F. Giudice, E.P. Glasbrenner, J. Glick, P.W. Graham, E. Granados, P.F. Griffin, J. Gué, S. Guellati-Khelifa, S. Gupta, V. Gupta, L. Hackermueller, M. Haehnelt, T. Hakulinen, K. Hammerer, E.T. Hanmeli, T. Harte, S. Hartmann, L. Hawkins, A. Hees, A. Herbst, T.M. Hird, R. Hobson, J. Hogan, B. Holst, M. Holynski, O. Hosten, C.C. Hsu, W.C.W. Huang, K.M. Hughes, K. Hussain, G. Hütsi, A. Iovino, M.C. Isfan, G. Janson, P. Jeglid, P. Jetzer, Y. Jiang, G. Juzelibnas, W. Kaenders, M. Kalliokoski, A. Kehagias, E. Kilian, C. Klempt, P. Knight, S. Koley, B. Konrad, T. Kovachy, M. Krutzik, M. Kumar, P. Kumar, H. Labiad, S.Y. Lan, A. Landragin, G. Landsberg, M. Langlois, B. Lanigan, B. Leone, C. Le Poncin-Lafitte, S. Lellouch, M. Lewicki, Y.H. Lien, L. Lombriser, E.L. Asamar, J.L. Lopez-Gonzalez, C. Lu, G.G. Luciano, N. Lundblad, C. De J. López Monjaraz, A. Lowe, M. Mackoit-Sinkevidien, M. Maggiore, A. Majumdar, K. Makris, A. Maleknejad, A.L. Marchant, A. Mariotti, C. Markou, B. Matthews, A. Mazumdar, C. Mccabe, M. Meister, G. Mentasti, J. Menu, G. Messineo, B. Meyer-Hoppe, S. Micalizio, F. Migliaccio, P. Millington, M. Milosevic, A. Mishra, J. Mitchell, G.W. Morley, N. Mouelle, J. Müller, D. Newbold, W.T. Ni, C. Niehof, J. Noller, S. Odeak, D.K.L. Oi, A. Oikonomou, Y. Omar, C. Overstreet, V. Puthiya Veettil, J. Pahl, S. Paling, Z. Pan, G. Pappas, V. Pareek, E. Pasatembou, M. Paternostro, V.K. Pathak, E. Pelucchi, F. Pereira Dos Santos, A. Peters, A. Pichery, I. Pikovski, A. Pilaftsis, F.C. Pislan, R. Plunkett, R. Poggiani, M. Prevedelli, J. Rafelski, J. Raidal, M. Raidal, E.M. Rasel, S. Renaux-Petel, A. Richaud, P. Rivero-Antunez, T. Rodzinka, A. Roura, J. Rudolph, D. Sabulsky, M.S. Safronova, M. Sakellariadou, L. Salvi, M. Sameed, S. Sarkar, P. Schach, S.A. Schäffer, J. Schelfhout, M. Schilling, V. Schkolnik, W.P. Schleich, D. Schlippert, U. Schneider, F. Schreck, A. Schwartzman, N. Schwersenz, O. Sergijenko, H.R. Sfar, L. Shao, I. Shipsey, J. Shu, Y. Singh, C.F. Sopuerta, M. Sorba, F. Sorrentino, A.D.A.M. Spallicci, P. Stefanescu, N. Stergioulas, D. Stoerk, H. Thaivalappil Sunilkumar, J. Ströhle, Z. Tam, D. Tandon, Y. Tang, D. Tell, J. Tempere, D.J. Temples, R.P. Thampy, I.C. Tietje, G.M. Tino, J.N. Tinsley, O. Tintareanu Mircea, K. Tkaldec, A.J. Tolley, V. Tornatore, A. Torres-Orjuela, P. Treutlein, A. Trombettoni, C. Ufrecht, J. Urrutia, T. Valenzuela, L.R. Valerio, M. Van Der Grinten, V. Vaskonen, V. Vázquez-Aceves, H. Veermäe, F. Vetrano, N.V. Vitanov, W. Von Klitzing, S. Wald, T. Walker, R. Walser, J. Wang, Y. Wang, C.A. Weidner, A. Wenzlawski, M. Werner, L. Wörner, M.E. Yahia, E. Yazgan, E. Zambrini Cruzeiro, M. Zarei, M. Zhan, S. Zhang, L. Zhou, E. Zupanid, EPJ Quantum Technology 12 (2025).

Zigzag optical cavity for sensing and controlling torsional motion
S. Agafonova, U. Mishra, F.R. Diorico, O. Hosten, Physical Review Research 6 (2024).

Laser-cavity locking utilizing beam ellipticity: accessing the 10<sup>7</sup> instability scale relative to cavity linewidth
F.R. Diorico, A. Zhutov, O. Hosten, Optica 11 (2024) 26–31.

One-milligram torsional pendulum toward experiments at the quantum-gravity interface
S. Agafonova, P. Rosello, M. Mekonnen, O. Hosten, ArXiv (n.d.).

Monitoring and active stabilization of laser injection locking using beam ellipticity
U. Mishra, V. Li, S. Wald, S. Agafonova, F.R. Diorico, O. Hosten, Optics Letters 48 (2023) 3973–3976.

Analog stabilization of an electro-optic I/Q modulator with an auxiliary modulation tone
S. Wald, F.R. Diorico, O. Hosten, Applied Optics 62 (2023) 1–7.

Constraints on probing quantum coherence to infer gravitational entanglement
O. Hosten, Physical Review Research 4 (2022).

Laser frequency-offset locking at 10-Hz-level instability using hybrid electronic filters
V. Li, F.R. Diorico, O. Hosten, Physical Review Applied 17 (2022).

Improving cold-atom sensors with quantum entanglement: Prospects and challenges
S.S. Szigeti, O. Hosten, S.A. Haine, Applied Physics Letters 118 (2021).

Free space Ramsey spectroscopy in rubidium with noise below the quantum projection limit
B.K. Malia, J. Martínez-Rincón, Y. Wu, O. Hosten, M.A. Kasevich, Physical Review Letters 125 (2020).

Retrieval of cavity-generated atomic spin squeezing after free-space release
Y. Wu, R. Krishnakumar, J. Martínez-Rincón, B.K. Malia, O. Hosten, M.A. Kasevich, Physical Review A 102 (2020).

Bell correlations in spin-squeezed states of 500 000 atoms
N. Engelsen, R. Krishnakumar, O. Hosten, M. Kasevich, Physical Review Letters 118 (2017).

Quantum phase magnification
O. Hosten, R. Krishnakumar, N. Engelsen, M. Kasevich, Science 352 (2016) 1552–1555.

Measurement noise 100 times lower than the quantum-projection limit using entangled atoms
O. Hosten, N. Engelsen, R. Krishnakumar, M. Kasevich, Nature 529 (2016) 505–508.

Engineering spin squeezed states for quantum-enhanced atom interferometry
N. Engelsen, O. Hosten, R. Krishnakumar, M. Kasevich, in:, IEEE, 2016.

Many-atom-cavity QED system with homogeneous atom-cavity coupling
J. Lee, G. Vrijsen, I. Teper, O. Hosten, M. Kasevich, Optics Letters 39 (2014) 4005–4008.

Polarization dependent focusing
D. Schmid, T. Huang, R. Dirks, O. Hosten, P. Kwiat, in:, OSA, 2013.

Adjustable and robust methods for polarization-dependent focusing
D. Schmid, T. Huang, S. Hazrat, R. Dirks, O. Hosten, S. Quint, D. Thian, P. Kwiat, Optics Express 21 (2013) 15538–15552.

Quantum physics: How to catch a wave
O. Hosten, Nature 474 (2011) 170–171.

Methods towards achieving precise birefringent focusing
D. Schmid, S. Hazrat, R. Rangarajan, O. Hosten, S. Quint, P. Kwiat, in:, OSA, 2011.