Speed limits and locality in many-body quantum dynamics

CFA Chen, A Lucas, C Yin - Reports on Progress in Physics, 2023 - iopscience.iop.org
We review the mathematical speed limits on quantum information processing in many-body
systems. After the proof of the Lieb–Robinson Theorem in 1972, the past two decades have …

Lieb-Robinson light cone for power-law interactions

MC Tran, AY Guo, CL Baldwin, A Ehrenberg… - Physical review …, 2021 - APS
The Lieb-Robinson theorem states that information propagates with a finite velocity in
quantum systems on a lattice with nearest-neighbor interactions. What are the speed limits …

Transport and entanglement growth in long-range random Clifford circuits

J Richter, O Lunt, A Pal - Physical Review Research, 2023 - APS
Conservation laws can constrain entanglement dynamics in isolated quantum systems,
manifest in a slowdown of higher Rényi entropies. Here, we explore this phenomenon in a …

Effective light cone and digital quantum simulation of interacting bosons

T Kuwahara, TV Vu, K Saito - Nature Communications, 2024 - nature.com
The speed limit of information propagation is one of the most fundamental features in non-
equilibrium physics. The region of information propagation by finite-time dynamics is …

Concentration for random product formulas

CF Chen, HY Huang, R Kueng, JA Tropp - PRX Quantum, 2021 - APS
Quantum simulation has wide applications in quantum chemistry and physics. Recently,
scientists have begun exploring the use of randomized methods for accelerating quantum …

Optimal state transfer and entanglement generation in power-law interacting systems

MC Tran, AY Guo, A Deshpande, A Lucas… - Physical Review X, 2021 - APS
We present an optimal protocol for encoding an unknown qubit state into a multiqubit
Greenberger-Horne-Zeilinger-like state and, consequently, transferring quantum information …

Finite speed of quantum information in models of interacting bosons at finite density

C Yin, A Lucas - Physical Review X, 2022 - APS
We prove that quantum information propagates with a finite velocity in any model of
interacting bosons whose (possibly time-dependent) Hamiltonian contains spatially local …

[PDF][PDF] Optimal light cone and digital quantum simulation of interacting bosons

T Kuwahara, T Van Vu, K Saito - arxiv preprint arxiv:2206.14736, 2022 - researchmap.jp
A fundamental principle of many-body physics is causality: a strict prohibition of information
propagation outside the light cone. However, in non-relativistic systems, it is often unclear …

Operator growth bounds from graph theory

CF Chen, A Lucas - Communications in Mathematical Physics, 2021 - Springer
Let A and B be local operators in Hamiltonian quantum systems with N degrees of freedom
and finite-dimensional Hilbert space. We prove that the commutator norm‖[A (t), B]‖ is …

Frobenius light cone and the shift unitary

C Yin, A Lucas, DT Stephen - Physical Review A, 2024 - APS
We bound the time necessary to implement the shift unitary on a one-dimensional ring, both
by using local Hamiltonians and those with power-law interactions. This time is constrained …