I am a theoretical physicist at the University of California, Berkeley. My interests are in many-body quantum mechanics and the interface between quantum and classical simulation. Here there are connections to be made between statistical mechanics, quantum information, and conventional condensed matter physics.
Recent topics
Quantum algorithms
Measurement-induced collective phenomena
Many-body quantum chaos and localisation
Research & Education
Sep. 21 - now: Moore Fellowship in Berkeley, working with Ehud Altman and Joel Moore.
Oct. 17 - Jul. 21: DPhil from Oxford, working with John Chalker.
Oct. 13 - Jul. 17: BA + MSci from Cambridge, with research in the group of Zoran Hadzibabic.
Preprints
https://arxiv.org/abs/2407.07893
Quantum Algorithm to Prepare Quasi-Stationary States
Samuel J. Garratt, Soonwon Choihttps://arxiv.org/abs/2312.14234
Operator dynamics in Floquet many-body systems
Takato Yoshimura, Samuel J. Garratt, J. T. Chalker
Publications
Phys. Rev. X Quantum 5, 030311 (2024)
https://arxiv.org/abs/2305.20092
Probing post-measurement entanglement without post-selection
Samuel J. Garratt, Ehud Altman
Phys. Rev. B 107, 245132 (2023) https://arxiv.org/abs/2301.08268
Nonlocality and entanglement in measured critical quantum Ising chains
Zack Weinstein, Rohith Sajith, Ehud Altman, Samuel J. GarrattPhys. Rev. X 13, 021026 (2023) https://arxiv.org/abs/2207.09476
Measurements conspire nonlocally to restructure critical quantum states
Samuel J. Garratt, Zack Weinstein, Ehud AltmanPhys. Rev. B 106, 054309 (2022) https://arxiv.org/abs/2202.10482
Resonant energy scales and local observables in the many-body localized phase
Samuel J. Garratt, Sthitadhi RoyPhys. Rev. A 106, 012441 (2022) https://arxiv.org/abs/2202.05132
Quantifying information scrambling via Classical Shadow Tomography on Programmable Quantum Simulators
Max McGinley, Sebastian Leontica, Samuel J. Garratt, Jovan Jovanovic, Steven H. Simon
Phys. Rev. B 104, 184203 (2021) https://arxiv.org/abs/2107.12387
Local resonances and parametric level dynamics in the many-body localised phase
S. J Garratt, Sthitadhi Roy, J. T. ChalkerPhys. Rev. Lett. 127, 026802 (2021) https://arxiv.org/abs/2012.11580
Many-body delocalisation as symmetry breaking
S. J Garratt, J. T. ChalkerPhys. Rev. X 11, 021051 (2021) https://arxiv.org/abs/2008.01697
Local pairing of Feynman histories in many-body Floquet models
S. J. Garratt, J. T. ChalkerPhys. Rev. Lett. 126, 060402 https://arxiv.org/abs/2004.11363
Many-body Decay of the Gapped Lowest Excitation of a Bose-Einstein Condensate
Jinyi Zhang, Christoph Eigen, Wei Zheng, Jake A. P. Glidden, Timon A. Hilker, Samuel J. Garratt, Raphael Lopes, Nigel R. Cooper, Zoran Hadzibabic, Nir NavonPhys. Rev. B 101, 024413 (2020) https://arxiv.org/abs/1908.02271
Goldstone modes in the emergent gauge fields of a frustrated magnet
Samuel J. Garratt, J. T. ChalkerPhys. Rev. A 99, 021601(R) (2019) https://arxiv.org/abs/1810.08195
From single-particle excitations to sound waves in a box-trapped atomic Bose-Einstein condensate
Samuel J. Garratt, Christoph Eigen, Jinyi Zhang, Patrik Turzák, Raphael Lopes, Robert P. Smith, Zoran Hadzibabic, Nir Navon
Teaching
Sep. 21 - now: advising undergraduate and graduate research students.
Oct. 19 - Sep. 21: stipendiary lecturer at St. Hugh's College, Oxford, for MPhys.
Sep. 18 - Jan. 19: class tutor/organiser for Oxford MMathPhys.
Jan. 18 - Oct. 19: tutor at St. Hugh's College, Oxford, for MPhys.
Invited Talks
IST Austria - Jul 24
University of New Mexico - Apr 24
University of Cambridge - Mar 24
University of Cologne - Mar 24
PKS Dresden, Quantum Interactive Dynamics - Mar 24
APS Minneapolis, symposium on Sculpting long-range entangled states with measurement and adaptive circuits - March 24
University of Minnesota - Feb 24
University of California, Berkeley - Jan 24
Stanford University - Dec 23
Cornell University - Oct 23
California Institute of Technology - Oct 23
Massachusetts Institute of Technology - July 23
University of Erlangen-Nuremberg - June 23
Simons Institute for the Theory of Computing, workshop on ‘Provable NISQ Quantum Advantage’ - June 23
University of Geneva - May 23
Institut Pascal, workshop on many-body quantum chaos - Apr 23
University of Oxford, Quantum Interactive Dynamics - Mar 23
University of California, Berkeley, Geoflow - Mar 23
University of California, Los Angeles - Mar 23
McGill University - Feb 23
University of Montreal - Feb 23
University of California, Santa Cruz - Feb 23
University of Geneva - Jan 23
Weizmann Institute, workshop on quantum many-body systems - Dec 22
New York, conference on frontiers of quantum condensed matter physics - Nov 22
KITP, workshop on quantum many-body dynamics and NISQ systems - Sep 22
University of Bonn - Jun 22
University of Cologne - Jun 22
PKS Dresden, workshop on Quantum chaos and holography - Jun 22
APS Chicago, symposium on many-body localisation - Mar 22
University of California, Berkeley - Sep 21
University of California, Santa Barbara - Dec 20
University of Geneva - Oct 20
University of California, Berkeley - Oct 20
QChaos - Quantum chaos online seminars - Jun 20