dorsal/arxiv
View SchemaSuperbroadcasting of harmonic oscillators mixed states
| Authors | G. M. D'Ariano, P. Perinotti, M. F. Sacchi |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0609046 |
| URL | https://arxiv.org/abs/quant-ph/0609046 |
| DOI | 10.1134/S0030400X07070259 |
| Journal | Optics and Spectroscopy 103, 170 (2007) |
Abstract
We consider the problem of broadcasting quantum information encoded in the displacement parameter for an harmonic oscillator, from N to M>N copies of a thermal state. We show the Weyl-Heisenberg covariant broadcasting map that optimally reduces the thermal photon number, and we prove that it minimizes the noise in conjugate quadratures at the output for general input states. We find that from two input copies broadcasting is feasible, with the possibility of simultaneous purification (superbroadcasting).
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"abstract": "We consider the problem of broadcasting quantum information encoded in the\ndisplacement parameter for an harmonic oscillator, from N to M\u003eN copies of a\nthermal state. We show the Weyl-Heisenberg covariant broadcasting map that\noptimally reduces the thermal photon number, and we prove that it minimizes the\nnoise in conjugate quadratures at the output for general input states. We find\nthat from two input copies broadcasting is feasible, with the possibility of\nsimultaneous purification (superbroadcasting).",
"arxiv_id": "quant-ph/0609046",
"authors": [
"G. M. D\u0027Ariano",
"P. Perinotti",
"M. F. Sacchi"
],
"categories": [
"quant-ph"
],
"doi": "10.1134/S0030400X07070259",
"journal_ref": "Optics and Spectroscopy 103, 170 (2007)",
"title": "Superbroadcasting of harmonic oscillators mixed states",
"url": "https://arxiv.org/abs/quant-ph/0609046"
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