87 citations · 426 across the 10 of their papers we have counts for
10 papers
Operator dynamics in Floquet many-body systems
Takato Yoshimura, Samuel J. Garratt, J. T. Chalker
We study operator dynamics in many-body quantum systems, focusing on generic features of systems that are ergodic, spatially extended, and lack conserved densities. Quantum circuit…
Probing post-measurement entanglement without post-selection
Samuel J. Garratt, Ehud Altman
We study the problem of observing quantum collective phenomena emerging from large numbers of measurements. These phenomena are difficult to observe in conventional experiments bec…
Nonlocality and entanglement in measured critical quantum Ising chains
Zack Weinstein, Rohith Sajith, Ehud Altman +1
We study the effects of measurements, performed with a finite density in space, on the ground state of the one-dimensional transverse-field Ising model at criticality. Local degree…
Measurements conspire nonlocally to restructure critical quantum states
Samuel J. Garratt, Zack Weinstein, Ehud Altman
We study theoretically how local measurements perfomed on critical quantum ground states affect long-distance correlations. These states are highly entangled and feature algebraic…
Resonant energy scales and local observables in the many-body localised phase
Samuel J. Garratt, Sthitadhi Roy
We formulate a theory for resonances in the many-body localised (MBL) phase of disordered quantum spin chains in terms of local observables. A key result is to show that there are…
Quantifying information scrambling via Classical Shadow Tomography on Programmable Quantum Simulators
Max McGinley, Sebastian Leontica, Samuel J. Garratt +2
We develop techniques to probe the dynamics of quantum information, and implement them experimentally on an IBM superconducting quantum processor. Our protocols adapt shadow tomogr…
Local resonances and parametric level dynamics in the many-body localised phase
S. J. Garratt, Sthitadhi Roy, J. T. Chalker
By varying the disorder realisation in the many-body localised (MBL) phase, we investigate the influence of resonances on spectral properties. The standard theory of the MBL phase…
Local pairing of Feynman histories in many-body Floquet models
S. J. Garratt, J. T. Chalker
We study many-body quantum dynamics using Floquet quantum circuits in one space dimension as simple examples of systems with local interactions that support ergodic phases. Physica…
Many-body Decay of the Gapped Lowest Excitation of a Bose-Einstein Condensate
Jinyi Zhang, Christoph Eigen, Wei Zheng +7
We study the decay mechanism of the gapped lowest-lying excitation of a quasi-pure box-trapped atomic Bose-Einstein condensate. Owing to the absence of lower-energy modes, or direc…
From single-particle excitations to sound waves in a box-trapped atomic Bose-Einstein condensate
Samuel J. Garratt, Christoph Eigen, Jinyi Zhang +5
We experimentally and theoretically investigate the lowest-lying axial excitation of an atomic Bose-Einstein condensate in a cylindrical box trap. By tuning the atomic density, we…