I am a researcher in the foundations of quantum theory and quantum information theory. I am a junior professor (tenure-track) in the Laboratoire des Méthodes Formelles at the Université Paris-Saclay. Previously I was a postdoctoral researcher in Markus Müller's group in IQOQI, Vienna, and before this I was a postdoctoral fellow at the Perimeter Institute. I obtained my PhD from University College London in 2018 studying modifications to the measurement postulates of quantum theory. Email address: (firstname) dot (lastname) at universite-paris-saclay dot fr
Esteban Castro-Ruiz, Thomas D. Galley and Leon Loveridge. Interpreting quantum-reference-frame transformations through a simple example. Phys. Rev. A 114, 032201 (2026). https://doi.org/10.1103/czr8-dv1l
Stefan L. Ludescher, Manuel Mekonnen, Thomas D. Galley and Markus P. Müller. Quantum reference frames beyond subsystems: a reconstruction and generalization of the perspective-neutral framework. arXiv:2607.24976 (2026). https://arxiv.org/abs/2607.24976
Hannah Troger, Ofek Bengyat, Thomas D. Galley and Marios Christodoulou. Complete Relational Description of Spin in a Quantum Background. arXiv:2606.15873 (2026). https://arxiv.org/abs/2606.15873
Manuel Mekonnen, Thomas D. Galley and Markus P. Müller. Invariance under quantum permutations rules out parastatistics. Nature Communications 17, 6947 (2026). https://doi.org/10.1038/s41467-026-73064-6
Stefan L. Ludescher, Leon D. Loveridge, Thomas D. Galley and Markus P. Müller. Gravity-mediated entanglement via infinite-dimensional systems. J. Phys. A: Math. Theor. 59, 215302 (2026). https://doi.org/10.1088/1751-8121/ae65e7
Lorenzo Catani, Thomas D. Galley and Tomáš Gonda. Resource-theoretic hierarchy of contextuality for general probabilistic theories. Quantum 10, 2077 (2026). https://doi.org/10.22331/q-2026-04-21-2077
Albert Aloy, Matteo Fadel, Thomas D. Galley, Caroline L. Jones and Markus P. Müller. Theory-independent monitoring of the decoherence of a superconducting qubit with generalized contextuality. Nature Communications 17, 2474 (2026). https://doi.org/10.1038/s41467-026-69030-x
Daniel Centeno, Marco Erba, Thomas D. Galley, David Schmid, John H. Selby, Robert W. Spekkens, Sina Soltani, Jacopo Surace, Alex Wilce and Yìlè Yīng. Symmetry-induced failures of tomographic locality: Constructing foil theories by twirling. Phys. Rev. A 112, L030202 (2025). https://doi.org/10.1103/hpmv-15sf
Lluís Masanes, Thomas D. Galley and Markus P. Müller. Response to "The measurement postulates of quantum mechanics are not redundant". Quantum 9, 1592 (2025). https://quantum-journal.org/papers/q-2025-01-14-1592/
Albert Aloy, Thomas D. Galley, Caroline L. Jones, Stefan L. Ludescher and Markus P. Müller. Spin-bounded correlations: rotation boxes within and beyond quantum theory. Commun. Math. Phys. 405, 292 (2024). https://doi.org/10.1007/s00220-024-05123-2
Thomas D. Galley, Flaminia Giacomini and John H. Selby. Any consistent coupling between classical gravity and quantum matter is fundamentally irreversible. Quantum 7, 1142 (2023). https://doi.org/10.22331/q-2023-10-16-1142
Thomas D. Galley, Lluís Masanes and Markus P. Müller. Reply to "Masanes-Galley-Müller and the State-Update Postulate". arXiv:2212.03629 (2022). https://arxiv.org/abs/2212.03629
Thomas D. Galley, Flaminia Giacomini and John H. Selby. A no-go theorem on the nature of the gravitational field beyond quantum theory. Quantum 6, 779 (2022). https://doi.org/10.22331/q-2022-08-17-779
Paulo J. Cavalcanti, John H. Selby, Jamie Sikora, Thomas D. Galley and Ana Belén Sainz. Post-quantum steering is a stronger-than-quantum resource for information processing. npj Quantum Information 8, 76 (2022). https://www.nature.com/articles/s41534-022-00574-8
Shadi Ali Ahmad, Thomas D. Galley, Philipp A. Höhn, Maximilian P. E. Lock and Alexander R. H. Smith. Quantum Relativity of Subsystems. Phys. Rev. Lett. 128, 170401 (2022). https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.128.170401
Anne-Catherine de la Hamette, Thomas D. Galley, Philipp A. Höhn, Leon Loveridge and Markus P. Müller. Perspective-neutral approach to quantum frame covariance for general symmetry groups. arXiv:2110.13824 (2021). https://arxiv.org/abs/2110.13824
Thomas D. Galley and Lluís Masanes. How dynamics constrains probabilities in general probabilistic theories. Quantum 5, 457 (2021). https://doi.org/10.22331/q-2021-05-21-457
Anne-Catherine de la Hamette and Thomas D. Galley. Quantum reference frames for general symmetry groups. Quantum 4, 367 (2020). https://doi.org/10.22331/q-2020-11-30-367
Lluís Masanes, Thomas D. Galley and Markus P. Müller. The measurement postulates of quantum mechanics are operationally redundant. Nature Communications 10, 1361 (2019). https://doi.org/10.1038/s41467-019-09348-x
Thomas D. Galley and Lluís Masanes. Any modification of the Born rule leads to a violation of the purification and local tomography principles. Quantum 2, 104 (2018). https://doi.org/10.22331/q-2018-11-06-104
Thomas D. Galley and Lluís Masanes. Classification of all alternatives to the Born rule in terms of informational properties. Quantum 1, 15 (2017). https://doi.org/10.22331/q-2017-07-14-15
Classification to all alternatives to the Born rule. QPL 2017. Link
Modifying the measurement postulates (and more). Perimeter Institute Quantum Foundations Seminar, 2018. Link
Compatibility of implicit and explicit observers in quantum theory and beyond. Observers in Quantum and Foil Theories, 2018. Link
How dynamics constrain probabilities in general probabilistic theories, QPL, 2020. Link
A no-go theorem on the nature of the gravitational field beyond quantum theory, Quantum Boundaries, 2021. Link
Principle based approaches to the nature of gravity, RQI Vienna, 2023. Link
Article in quanta magazine here about "The measurement postulates of quantum mechanics are operationally redundant." a paper I co-authored with Lluís Masanes and Markus Müller.