dorsal/arxiv
View SchemaAll local quantum states are mixtures of direct products
| Authors | Lajos Diosi |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/9506004 |
| URL | https://arxiv.org/abs/quant-ph/9506004 |
Abstract
According to Popescu's recent analysis [Phys. Rev. Lett. {\bf72}, 797 (1994)], {\it nonideal} measurements, rather than ideal ones, may be more sensitive to reveal nonlocal correlations between distant parts of composite quantum systems. The outcome statistics of joint nonideal measurements on local states should by definition admit local hidden variable models. We prove that the density operator of a local composite system must be convex mixture of the subsystems' density operators. This result depends essentially on a plausible consistency condition restricting the class of admissible local hidden variable models.
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"abstract": "According to Popescu\u0027s recent analysis [Phys. Rev. Lett. {\\bf72}, 797\n(1994)], {\\it nonideal} measurements, rather than ideal ones, may be more\nsensitive to reveal nonlocal correlations between distant parts of composite\nquantum systems. The outcome statistics of joint nonideal measurements on local\nstates should by definition admit local hidden variable models. We prove that\nthe density operator of a local composite system must be convex mixture of the\nsubsystems\u0027 density operators. This result depends essentially on a plausible\nconsistency condition restricting the class of admissible local hidden variable\nmodels.",
"arxiv_id": "quant-ph/9506004",
"authors": [
"Lajos Diosi"
],
"categories": [
"quant-ph"
],
"title": "All local quantum states are mixtures of direct products",
"url": "https://arxiv.org/abs/quant-ph/9506004"
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