Learning many-body Hamiltonians with Heisenberg-limited scaling

HY Huang, Y Tong, D Fang, Y Su - Physical Review Letters, 2023 - APS
Learning a many-body Hamiltonian from its dynamics is a fundamental problem in physics.
In this Letter, we propose the first algorithm to achieve the Heisenberg limit for learning an …

[PDF][PDF] Learning quantum Hamiltonians at any temperature in polynomial time

A Bakshi, A Liu, A Moitra, E Tang - Proceedings of the 56th Annual ACM …, 2024 - dl.acm.org
We study the problem of learning a local quantum Hamiltonian H given copies of its Gibbs
state ρ= e− β H/(e− β H) at a known inverse temperature β> 0. Anshu, Arunachalam …

Optimal learning of quantum Hamiltonians from high-temperature Gibbs states

J Haah, R Kothari, E Tang - 2022 IEEE 63rd Annual Symposium …, 2022 - ieeexplore.ieee.org
We study the problem of learning a Hamiltonian H to precision ε, supposing we are given
copies of its Gibbs state ρ=\exp(-βH)/Tr(\exp(-βH)) at a known inverse temperature β. Anshu …

The advantage of quantum control in many-body Hamiltonian learning

A Dutkiewicz, TE O'Brien, T Schuster - Quantum, 2024 - quantum-journal.org
We study the problem of learning the Hamiltonian of a many-body quantum system from
experimental data. We show that the rate of learning depends on the amount of control …

Heisenberg-limited Hamiltonian learning for interacting bosons

H Li, Y Tong, T Gefen, H Ni, L Ying - npj Quantum Information, 2024 - nature.com
We develop a protocol for learning a class of interacting bosonic Hamiltonians from
dynamics with Heisenberg-limited scaling. For Hamiltonians with an underlying bounded …

Parameterized Hamiltonian learning with quantum circuit

J Shi, W Wang, X Lou, S Zhang… - IEEE Transactions on …, 2022 - ieeexplore.ieee.org
Hamiltonian learning, as an important quantum machine learning technique, provides a
significant approach for determining an accurate quantum system. This paper establishes …

Efficient and robust estimation of many-qubit Hamiltonians

D Stilck França, LA Markovich, VV Dobrovitski… - Nature …, 2024 - nature.com
Characterizing the interactions and dynamics of quantum mechanical systems is an
essential task in developing quantum technologies. We propose an efficient protocol based …

[PDF][PDF] Learning shallow quantum circuits

HY Huang, Y Liu, M Broughton, I Kim, A Anshu… - Proceedings of the 56th …, 2024 - dl.acm.org
Despite fundamental interests in learning quantum circuits, the existence of a
computationally efficient algorithm for learning shallow quantum circuits remains an open …

Characterization and verification of trotterized digital quantum simulation via hamiltonian and liouvillian learning

L Pastori, T Olsacher, C Kokail, P Zoller - PRX Quantum, 2022 - APS
The goal of digital quantum simulation is to approximate the dynamics of a given target
Hamiltonian via a sequence of quantum gates, a procedure known as Trotterization. The …

Learning conservation laws in unknown quantum dynamics

Y Zhan, A Elben, HY Huang, Y Tong - PRX Quantum, 2024 - APS
We present a learning algorithm for discovering conservation laws given as sums of
geometrically local observables in quantum dynamics. This includes conserved quantities …