dorsal/arxiv
View SchemaHeterodyne and adaptive phase measurements on states of fixed mean photon number
| Authors | D. W. Berry, H. M. Wiseman, Zhong-Xi Zhang |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/9812023 |
| URL | https://arxiv.org/abs/quant-ph/9812023 |
| DOI | 10.1103/PhysRevA.60.2458 |
| Journal | Phys. Rev. A 60, 2458 (1999) |
Abstract
The standard technique for measuring the phase of a single mode field is heterodyne detection. Such a measurement may have an uncertainty far above the intrinsic quantum phase uncertainty of the state. Recently it has been shown [H. M. Wiseman and R. B. Killip, Phys. Rev. A 57, 2169 (1998)] that an adaptive technique introduces far less excess noise. Here we quantify this difference by an exact numerical calculation of the minimum measured phase variance for the various schemes, optimized over states with a fixed mean photon number. We also analytically derive the asymptotics for these variances. For the case of heterodyne detection our results disagree with the power law claimed by D'Ariano and Paris [Phys. Rev. A 49, 3022 (1994)].
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"abstract": "The standard technique for measuring the phase of a single mode field is\nheterodyne detection. Such a measurement may have an uncertainty far above the\nintrinsic quantum phase uncertainty of the state. Recently it has been shown\n[H. M. Wiseman and R. B. Killip, Phys. Rev. A 57, 2169 (1998)] that an adaptive\ntechnique introduces far less excess noise. Here we quantify this difference by\nan exact numerical calculation of the minimum measured phase variance for the\nvarious schemes, optimized over states with a fixed mean photon number. We also\nanalytically derive the asymptotics for these variances. For the case of\nheterodyne detection our results disagree with the power law claimed by\nD\u0027Ariano and Paris [Phys. Rev. A 49, 3022 (1994)].",
"arxiv_id": "quant-ph/9812023",
"authors": [
"D. W. Berry",
"H. M. Wiseman",
"Zhong-Xi Zhang"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.60.2458",
"journal_ref": "Phys. Rev. A 60, 2458 (1999)",
"title": "Heterodyne and adaptive phase measurements on states of fixed mean photon number",
"url": "https://arxiv.org/abs/quant-ph/9812023"
},
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