dorsal/arxiv
View SchemaComment on "Loss-error compensation in quantum-state measurements"
| Authors | G. M. D'Ariano, C. Macchiavello |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/9701009 |
| URL | https://arxiv.org/abs/quant-ph/9701009 |
| DOI | 10.1103/PhysRevA.57.3131 |
| Journal | Phys.Rev. A57 (1998) 3131 |
Abstract
In the two papers [T. Kiss, U. Herzog, and U. Leonhardt, Phys. Rev. A 52, 2433 (1995); U. Herzog, Phys. Rev. A 53, 1245 (1996)] with titles similar to the one given above, the authors assert that in some cases it is possible to compensate a quantum efficiency $\eta\leq 1/2$ in quantum-state measurements, violating the lower bound 1/2 proved in a preceding paper [G. M. D'Ariano, U. Leonhardt and H. Paul, Phys. Rev. A 52, R1801 (1995)]. Here we re-establish the bound as unsurpassable for homodyning any quantum state, and show how the proposed loss-compensation method would always fail in a real measurement outside the allowed $\eta >1/2$ region.
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"abstract": "In the two papers [T. Kiss, U. Herzog, and U. Leonhardt, Phys. Rev. A 52,\n2433 (1995); U. Herzog, Phys. Rev. A 53, 1245 (1996)] with titles similar to\nthe one given above, the authors assert that in some cases it is possible to\ncompensate a quantum efficiency $\\eta\\leq 1/2$ in quantum-state measurements,\nviolating the lower bound 1/2 proved in a preceding paper [G. M. D\u0027Ariano, U.\nLeonhardt and H. Paul, Phys. Rev. A 52, R1801 (1995)]. Here we re-establish the\nbound as unsurpassable for homodyning any quantum state, and show how the\nproposed loss-compensation method would always fail in a real measurement\noutside the allowed $\\eta \u003e1/2$ region.",
"arxiv_id": "quant-ph/9701009",
"authors": [
"G. M. D\u0027Ariano",
"C. Macchiavello"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.57.3131",
"journal_ref": "Phys.Rev. A57 (1998) 3131",
"title": "Comment on \"Loss-error compensation in quantum-state measurements\"",
"url": "https://arxiv.org/abs/quant-ph/9701009"
},
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