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Title: Characterizing correlation within multipartite quantum systems via local randomized measurements
Authors: Liu, Zhenhuan
Zeng, Pei
Zhou, You
Gu, Mile
Keywords: Science::Physics
Issue Date: 2022
Source: Liu, Z., Zeng, P., Zhou, Y. & Gu, M. (2022). Characterizing correlation within multipartite quantum systems via local randomized measurements. Physical Review A, 105(2), 022407-.
Journal: Physical Review A
Abstract: Given a quantum system on many qubits split into a few different parties, how many total correlations are there between these parties? Such a quantity, aimed to measure the deviation of the global quantum state from an uncorrelated state with the same local statistics, plays an important role in understanding multipartite correlations within complex networks of quantum states. Yet, the experimental access of this quantity remains challenging as it tends to be nonlinear, and hence often requires tomography which becomes quickly intractable as dimensions of relevant quantum systems scale. Here, we introduce a much more experimentally accessible quantifier of total correlations, which can be estimated using only single-qubit measurements. It requires far fewer measurements than state tomography, and obviates the need to coherently interfere multiple copies of a given state. Thus we provide a tool for proving multipartite correlations that can be applied to near-term quantum devices.
ISSN: 2469-9926
DOI: 10.1103/PhysRevA.105.022407
Rights: © 2022 American Physical Society. All rights reserved. This paper was published in Physical Review A and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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