dorsal/arxiv
View SchemaFinding a maximally correlated state - Simultaneous Schmidt decomposition of bipartite pure states
| Authors | Tohya Hiroshima, Masahito Hayashi |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0405107 |
| URL | https://arxiv.org/abs/quant-ph/0405107 |
| DOI | 10.1103/PhysRevA.70.030302 |
| Journal | Phys. Rev. A 70, 030302(R) (2004) |
Abstract
We consider a bipartite mixed state of the form, $\rho =\sum_{\alpha, \beta =1}^{l}a_{\alpha \beta} | \psi_{\alpha}> < \psi_ \beta}| $, where $| \psi_{\alpha}>$ are normalized bipartite state vectors, and matrix $(a_{\alpha \beta})$ is positive semidefinite. We provide a necessary and sufficient condition for the state $\rho $ taking the form of maximally correlated states by a local unitary transformation. More precisely, we give a criterion for simultaneous Schmidt decomposability of $| \psi_{\alpha}>$ for $\alpha =1,2,..., l$. Using this criterion, we can judge completely whether or not the state $\rho $ is equivalent to the maximally correlated state, in which the distillable entanglement is given by a simple formula. For generalized Bell states, this criterion is written as a simple algebraic relation between indices of the states. We also discuss the local distinguishability of the generalized Bell states that are simultaneously Schmidt decomposable.
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"abstract": "We consider a bipartite mixed state of the form, $\\rho =\\sum_{\\alpha, \\beta\n=1}^{l}a_{\\alpha \\beta} | \\psi_{\\alpha}\u003e \u003c \\psi_ \\beta}| $, where $|\n\\psi_{\\alpha}\u003e$ are normalized bipartite state vectors, and matrix $(a_{\\alpha\n\\beta})$ is positive semidefinite. We provide a necessary and sufficient\ncondition for the state $\\rho $ taking the form of maximally correlated states\nby a local unitary transformation. More precisely, we give a criterion for\nsimultaneous Schmidt decomposability of $| \\psi_{\\alpha}\u003e$ for $\\alpha\n=1,2,..., l$. Using this criterion, we can judge completely whether or not the\nstate $\\rho $ is equivalent to the maximally correlated state, in which the\ndistillable entanglement is given by a simple formula. For generalized Bell\nstates, this criterion is written as a simple algebraic relation between\nindices of the states. We also discuss the local distinguishability of the\ngeneralized Bell states that are simultaneously Schmidt decomposable.",
"arxiv_id": "quant-ph/0405107",
"authors": [
"Tohya Hiroshima",
"Masahito Hayashi"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.70.030302",
"journal_ref": "Phys. Rev. A 70, 030302(R) (2004)",
"title": "Finding a maximally correlated state - Simultaneous Schmidt decomposition of bipartite pure states",
"url": "https://arxiv.org/abs/quant-ph/0405107"
},
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