Quantum computer systems for scientific discovery

Y Alexeev, D Bacon, KR Brown, R Calderbank, LD Carr… - PRX quantum, 2021 - APS
The great promise of quantum computers comes with the dual challenges of building them
and finding their useful applications. We argue that these two challenges should be …

Programmable quantum simulations of spin systems with trapped ions

C Monroe, WC Campbell, LM Duan, ZX Gong… - Reviews of Modern …, 2021 - APS
Laser-cooled and trapped atomic ions form an ideal standard for the simulation of interacting
quantum spin models. Effective spins are represented by appropriate internal energy levels …

Mixed-state entanglement from local randomized measurements

A Elben, R Kueng, HY Huang, R van Bijnen, C Kokail… - Physical Review Letters, 2020 - APS
We propose a method for detecting bipartite entanglement in a many-body mixed state
based on estimating moments of the partially transposed density matrix. The estimates are …

Probing Rényi entanglement entropy via randomized measurements

T Brydges, A Elben, P Jurcevic, B Vermersch, C Maier… - Science, 2019 - science.org
Entanglement is a key feature of many-body quantum systems. Measuring the entropy of
different partitions of a quantum system provides a way to probe its entanglement structure …

Benchmarking highly entangled states on a 60-atom analogue quantum simulator

AL Shaw, Z Chen, J Choi, DK Mark, P Scholl… - Nature, 2024 - nature.com
Quantum systems have entered a competitive regime in which classical computers must
make approximations to represent highly entangled quantum states,. However, in this …

Postselection-free entanglement dynamics via spacetime duality

M Ippoliti, V Khemani - Physical Review Letters, 2021 - APS
The dynamics of entanglement in “hybrid” nonunitary circuits (for example, involving both
unitary gates and quantum measurements) has recently become an object of intense study …

Observing ground-state properties of the Fermi-Hubbard model using a scalable algorithm on a quantum computer

S Stanisic, JL Bosse, FM Gambetta, RA Santos… - Nature …, 2022 - nature.com
The famous, yet unsolved, Fermi-Hubbard model for strongly-correlated electronic systems
is a prominent target for quantum computers. However, accurately representing the Fermi …

Noise resilience of variational quantum compiling

K Sharma, S Khatri, M Cerezo… - New Journal of Physics, 2020 - iopscience.iop.org
Variational hybrid quantum-classical algorithms (VHQCAs) are near-term algorithms that
leverage classical optimization to minimize a cost function, which is efficiently evaluated on …

Learning the quantum algorithm for state overlap

L Cincio, Y Subaşı, AT Sornborger… - New Journal of …, 2018 - iopscience.iop.org
Short-depth algorithms are crucial for reducing computational error on near-term quantum
computers, for which decoherence and gate infidelity remain important issues. Here we …

Variational fast forwarding for quantum simulation beyond the coherence time

C Cirstoiu, Z Holmes, J Iosue, L Cincio… - npj Quantum …, 2020 - nature.com
Trotterization-based, iterative approaches to quantum simulation (QS) are restricted to
simulation times less than the coherence time of the quantum computer (QC), which limits …