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Detecting entanglement of unknown continuous variable states with random measurements

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arxiv 2007.05650 v1 pith:5EFN3DBM submitted 2020-07-10 quant-ph

Detecting entanglement of unknown continuous variable states with random measurements

classification quant-ph
keywords entanglementmeasurementsrandomcontinuouscovariancedetectionmatricesstates
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We explore the possibility of entanglement detection in continuous variable systems by entanglement witnesses based on covariance matrices, constructible from random homodyne measurements. We propose new linear constraints characterizing the entanglement witnesses based on second moments, and use them in a semidefinite program providing the optimal entanglement test for given random measurements. We test the method on the class of squeezed vacuum states and study the efficiency of entanglement detection in general unknown covariance matrices.

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