Noise-adaptive test of quantum correlations with quasiprobability functions

2020/02/29 by Seung-Woo Lee, Jaewan Kim, Wonmin Son · 2 citations
Computer Science · Mathematics · Physics and Astronomy · #Computer science #Mathematics #Noise (video) #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum discord #Quantum entanglement #Quantum mechanics #Statistical physics #quant-ph

paper · pdf · doi:10.1103/physreva.102.012408

published in Physical Review A 102(1) (American Physical Society) · 9 pages, 3 figures, published version

openalex publication_date 2020/07/07 · arxiv created 2020/07/08 · arxiv updated 2020/07/09 · openalex created_date 2020/07/16 · openalex updated_date 2026/08/05

Abstract

We introduce a method for testing quantum correlations in terms of quasiprobability functions in the presence of noise. We analyze the effects of measurement imperfection and thermal environment on quantum correlations and show that their noise effects can be well encapsulated into the change of the order parameter of the generalized quasiprobability function. We then formulate a noise-adaptive entanglement witness in the form of a Bell-type inequality by using the generalized quasiprobability function. Remarkably, it allows us to observe quantum correlations under severe noise. Our method provides a useful tool to test quantum correlations in near-term noisy quantum processors with continuous-variable systems.

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