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
Measurement in many-body systems.
Sums over histories and spectral statistics.
Many-body quantum chaos and localisation
Research & Education
Sep. 21 - now: Moore Fellowship at UC Berkeley, working in the group of Ehud Altman.
Oct. 17 - Jul. 21: DPhil at the University of Oxford [the thesis], under the supervision of John Chalker.
Oct. 16 - Jul. 17: MSci at the University of Cambridge, with research in the group of Zoran Hadzibabic.
Oct. 13 - Jul. 17: BA in Natural Sciences at the University of Cambridge.
Preprints
https://arxiv.org/abs/2312.14234
Operator dynamics in Floquet many-body systems
Takato Yoshimura, Samuel J. Garratt, J. T. Chalkerhttps://arxiv.org/abs/2305.20092
Probing post-measurement entanglement without post-selection
Samuel J. Garratt, Ehud Altman
Publications
Phys. Rev. B 107, 245132 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 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 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, 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, 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 https://arxiv.org/abs/2012.11580
Many-body delocalisation as symmetry breaking
S. J Garratt, J. T. ChalkerPhys. Rev. X 11, 021051 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 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) 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
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 - Sept 22
University of Bonn - June 22
University of Cologne - June 22
PKS Dresden, workshop on Quantum chaos and holography - June 22
APS Chicago, symposium on many-body localisation - March 22
University of California, Berkeley - September 21
University of California, Santa Barbara - December 20
University of Geneva - October 20
University of California, Berkeley - October 20
QChaos - Quantum chaos online seminars - June 20