dorsal/arxiv
View SchemaEntanglement transformation at absorbing and amplifying four-port devices
| Authors | Stefan Scheel, Ludwig Knoll, Tomas Opatrny, Dirk-Gunnar Welsch |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0004003 |
| URL | https://arxiv.org/abs/quant-ph/0004003 |
| DOI | 10.1103/PhysRevA.62.043803 |
| Journal | Phys. Rev. A 62, 043803 (2000) |
Abstract
Dielectric four-port devices play an important role in optical quantum information processing. Since for causality reasons the permittivity is a complex function of frequency, dielectrics are typical examples of noisy quantum channels, which cannot preserve quantum coherence. To study the effects of quantum decoherence, we start from the quantized electromagnetic field in an arbitrary Kramers--Kronig dielectric of given complex permittivity and construct the transformation relating the output quantum state to the input quantum state, without placing restrictions on the frequency. We apply the formalism to some typical examples in quantum communication. In particular we show that for entangled qubits the Bell-basis states $|\Psi^\pm>$ are more robust against decoherence than the states $|\Phi^\pm>$.
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"abstract": "Dielectric four-port devices play an important role in optical quantum\ninformation processing. Since for causality reasons the permittivity is a\ncomplex function of frequency, dielectrics are typical examples of noisy\nquantum channels, which cannot preserve quantum coherence. To study the effects\nof quantum decoherence, we start from the quantized electromagnetic field in an\narbitrary Kramers--Kronig dielectric of given complex permittivity and\nconstruct the transformation relating the output quantum state to the input\nquantum state, without placing restrictions on the frequency. We apply the\nformalism to some typical examples in quantum communication. In particular we\nshow that for entangled qubits the Bell-basis states $|\\Psi^\\pm\u003e$ are more\nrobust against decoherence than the states $|\\Phi^\\pm\u003e$.",
"arxiv_id": "quant-ph/0004003",
"authors": [
"Stefan Scheel",
"Ludwig Knoll",
"Tomas Opatrny",
"Dirk-Gunnar Welsch"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.62.043803",
"journal_ref": "Phys. Rev. A 62, 043803 (2000)",
"title": "Entanglement transformation at absorbing and amplifying four-port devices",
"url": "https://arxiv.org/abs/quant-ph/0004003"
},
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