We show that every Gaussian mixed quantum state can be disentangled by conjugation with a passive symplectic transformation, that is a metaplectic operator associated with a symplectic rotation. The main tools we use are the Werner-Wolf condition on covariance matrices and the symplectic covariance of Weyl quantization. Our result therefore complements a recent study by Lami, Serafini, and Adesso.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8550114 | PMC |
| http://dx.doi.org/10.1007/s11005-021-01410-4 | DOI Listing |
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