dorsal/arxiv
View SchemaMaximum efficiency of a linear-optical Bell-state analyzer
| Authors | John Calsamiglia, Norbert Lütkenhaus |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0007058 |
| URL | https://arxiv.org/abs/quant-ph/0007058 |
| DOI | 10.1007/s003400000484 |
| Journal | Appl. Phys. B 72, 67-71 (2001) |
Abstract
In a photonic realization of qubits the implementation of quantum logic is rather difficult due the extremely weak interaction on the few photon level. On the other hand, in these systems interference is available to process the quantum states. We formalize the use of interference by the definition of a simple class of operations which include linear optical elements, auxiliary states and conditional operations. We investigate an important subclass of these tools, namely linear optical elements and auxiliary modes in the vacuum state. For this tools, we are able to extend a previous quantitative result, a no-go theorem for perfect Bell state analyzer on two qubits in polarization entanglement, by a quantitative statement. We show, that within this subclass it is not possible to discriminate unambiguously four equiprobable Bell states with a probability higher than 50 %.
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"abstract": "In a photonic realization of qubits the implementation of quantum logic is\nrather difficult due the extremely weak interaction on the few photon level. On\nthe other hand, in these systems interference is available to process the\nquantum states. We formalize the use of interference by the definition of a\nsimple class of operations which include linear optical elements, auxiliary\nstates and conditional operations.\n We investigate an important subclass of these tools, namely linear optical\nelements and auxiliary modes in the vacuum state. For this tools, we are able\nto extend a previous quantitative result, a no-go theorem for perfect Bell\nstate analyzer on two qubits in polarization entanglement, by a quantitative\nstatement. We show, that within this subclass it is not possible to\ndiscriminate unambiguously four equiprobable Bell states with a probability\nhigher than 50 %.",
"arxiv_id": "quant-ph/0007058",
"authors": [
"John Calsamiglia",
"Norbert L\u00fctkenhaus"
],
"categories": [
"quant-ph"
],
"doi": "10.1007/s003400000484",
"journal_ref": "Appl. Phys. B 72, 67-71 (2001)",
"title": "Maximum efficiency of a linear-optical Bell-state analyzer",
"url": "https://arxiv.org/abs/quant-ph/0007058"
},
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