2 citations · 7 across the 13 of their papers we have counts for
14 papers
Thermal entanglement transitions from strong symmetry
Siqi Mo, Ehud Altman, Samuel J. Garratt
We study mixed-state entanglement in Gibbs states with strong symmetry, focusing on locally interacting spin systems with ferromagnetic interactions. Our main resu…
Entanglement transitions in translation-invariant tensor networks
Yi-Cheng Wang, Samuel J. Garratt, Ehud Altman
We study the complexity of approximately contracting translation-invariant tensor networks. The computational cost of row-by-row tensor network contraction, which defines a discret…
Quantum matter is weakly entangled at low energies
Samuel J. Garratt, Dmitry A. Abanin
We construct upper bounds on entanglement entropies of many-body quantum states that have fixed energy expectation values with respect to local Hamiltonians. Our focus is on entang…
Intrinsic Error Thresholds in Nearly Critical Toric Codes
Zack Weinstein, Samuel J. Garratt
We study the protection of information in nearly critical topological quantum codes, constructed by perturbing topological stabilizer codes towards continuous quantum phase transit…
Stability of quantum chaos against weak non-unitarity
Yi-Cheng Wang, Ehud Altman, Samuel J. Garratt
We study the quantum dynamics generated by the repeated action of a non-unitary evolution operator on a system of qubits. Breaking unitarity can lead to the purification of mixed i…
Fractional quantum Hall states under density decoherence
Zijian Wang, Ruihua Fan, Tianle Wang +2
Fractional quantum Hall states are promising platforms for topological quantum computation due to their capacity to encode quantum information in topologically degenerate ground st…
Lower bounds on the complexity of preparing mixed states
Max McGinley, Samuel J. Garratt
We establish a relationship between the correlations in a many-qubit mixed state and the minimum circuit depth needed for its preparation. If the mutual information between two sub…
Machine learning the effects of many quantum measurements
Wanda Hou, Samuel J. Garratt, Norhan M. Eassa +4
Measurements are essential for the processing and protection of information in quantum computers. They can also induce long-range entanglement between unmeasured qubits. However, w…
Learning transitions in classical Ising models and deformed toric codes
Malte Pütz, Samuel J. Garratt, Hidetoshi Nishimori +2
Conditional probability distributions describe the effect of learning an initially unknown classical state through Bayesian inference. Here we demonstrate the existence of a \texti…
Superspin Renormalization and Slow Relaxation in Random Spin Systems
Yi J. Zhao, Samuel J. Garratt, Joel E. Moore
We develop an excited-state real-space renormalization group (RSRG-X) formalism to describe the dynamics of conserved densities in randomly interacting spin- systems.…
Entanglement and private information in many-body thermal states
Samuel J. Garratt, Max McGinley
We use concepts from quantum cryptography to relate the entanglement in many-body mixed states to standard correlation functions. If a system can be used as a resource for distilli…
Goldstone mode of the broken helix in U(1) magnet EuIn2As2
Alex Liebman-Pelaez, Samuel J. Garratt, Veronika Sunko +5
Goldstone modes acquire a frequency gap in the presence of perturbations that break the underlying continuous symmetry. Here, we study the response of a spin-based Goldstone mode t…
Post-measurement Quantum Monte Carlo
Kriti Baweja, David J. Luitz, Samuel J. Garratt
We show how the effects of large numbers of measurements on many-body quantum ground and thermal states can be studied using Quantum Monte Carlo (QMC). Density matrices generated b…
Quantum Algorithm to Prepare Quasi-Stationary States
Samuel J. Garratt, Soonwon Choi
Quantum dynamics can be analyzed via the structure of energy eigenstates. However, in the many-body setting, preparing eigenstates associated with finite temperatures requires time…