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Benchmarking Information Scrambling

Joseph Harris
(
- Los Alamos and
- Cambridge U., DAMTP and
- U. Edinburgh
)
,
Bin Yan
(
- Los Alamos
)
,
Nikolai A. Sinitsyn
(
- Los Alamos
)

Oct 24, 2021

6 pages

Published in:

Phys.Rev.Lett. 129 (2022) 5, 050602

Published: Jul 26, 2022

e-Print:

2110.12355 [quant-ph]

DOI:

10.1103/PhysRevLett.129.050602 (publication)

Report number:

LA-UR-21-30539

View in:

reference search27 citations

Citations per year

Abstract: (APS)

Information scrambling refers to the rapid spreading of initially localized information over an entire system, via the generation of global entanglement. This effect is usually detected by measuring a temporal decay of the out-of-time order correlators. However, in experiments, decays of these correlators suffer from fake positive signals from various sources, e.g., decoherence due to inevitable couplings to the environment, or errors that cause mismatches between the purported forward and backward evolutions. In this Letter, we provide a simple and robust approach to single out the effect of genuine scrambling. This allows us to benchmark the scrambling process by quantifying the degree of the scrambling from the noisy backgrounds. We also demonstrate our protocol with simulations on IBM cloud-based quantum computers.

Note:

v2: published version; added new simulations on IBM quantum computers

correlation function
entanglement
decoherence
benchmark
background

References(43)

Figures(6)

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