The randomized measurement toolbox

A Elben, ST Flammia, HY Huang, R Kueng… - Nature Reviews …, 2023 - nature.com
Programmable quantum simulators and quantum computers are opening unprecedented
opportunities for exploring and exploiting the properties of highly entangled complex …

Provably efficient machine learning for quantum many-body problems

HY Huang, R Kueng, G Torlai, VV Albert, J Preskill - Science, 2022 - science.org
Classical machine learning (ML) provides a potentially powerful approach to solving
challenging quantum many-body problems in physics and chemistry. However, the …

Maximum entropy principle in deep thermalization and in hilbert-space ergodicity

DK Mark, F Surace, A Elben, AL Shaw, J Choi… - Physical Review X, 2024 - APS
We report universal statistical properties displayed by ensembles of pure states that
naturally emerge in quantum many-body systems. Specifically, two classes of state …

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 …

Preparing random states and benchmarking with many-body quantum chaos

J Choi, AL Shaw, IS Madjarov, X **e, R Finkelstein… - Nature, 2023 - nature.com
Producing quantum states at random has become increasingly important in modern
quantum science, with applications being both theoretical and practical. In particular …

Probing postmeasurement entanglement without postselection

SJ Garratt, E Altman - PRX Quantum, 2024 - APS
We study the problem of observing quantum collective phenomena emerging from large
numbers of measurements. These phenomena are difficult to observe in conventional …

Random unitaries in extremely low depth

T Schuster, J Haferkamp, HY Huang - arxiv preprint arxiv:2407.07754, 2024 - arxiv.org
We prove that random quantum circuits on any geometry, including a 1D line, can form
approximate unitary designs over $ n $ qubits in $\log n $ depth. In a similar manner, we …

Certifying almost all quantum states with few single-qubit measurements

HY Huang, J Preskill… - 2024 IEEE 65th Annual …, 2024 - ieeexplore.ieee.org
A fundamental challenge in quantum information science is certifying that an n-qubit state ρ
prepared in the lab closely matches a target state |ψ⟩. Previous approaches to this problem …

Exact emergent quantum state designs from quantum chaotic dynamics

WW Ho, S Choi - Physical Review Letters, 2022 - APS
We present exact results on a novel kind of emergent random matrix universality that
quantum many-body systems at infinite temperature can exhibit. Specifically, we consider an …

Dynamical purification and the emergence of quantum state designs from the projected ensemble

M Ippoliti, WW Ho - PRX Quantum, 2023 - APS
Quantum thermalization in a many-body system is defined by the approach of local
subsystems toward a universal form, describable as an ensemble of quantum states wherein …