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Noise-adaptive test of quantum correlations with quasiprobability functions

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arxiv 2002.05840 v2 pith:NI34KWQQ submitted 2020-02-14 quant-ph

Noise-adaptive test of quantum correlations with quasiprobability functions

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keywords quantumcorrelationsquasiprobabilitynoiseeffectsfunctionfunctionsgeneralized
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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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