dorsal/arxiv
View SchemaAnalogy between optimal spin estimation and interferometry
| Authors | Z. Hradil, M. Dusek |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/9911071 |
| URL | https://arxiv.org/abs/quant-ph/9911071 |
| DOI | 10.1016/S0030-4018(00)00809-9 |
Abstract
Scheme for optimal spin state estimation is considered in analogy with phase detection in interferometry. Recently reported coherent measurements yielding the average fidelity (N+1)/(N+2) for N particle system corresponds to the standard limit of phase resolution 1/\sqrt{N}. It provides the bound for incoherent measurements when each particle is detected separately and information is used optimally. For specific states, improvement up to the value 1/N is possible in quantum theory. The best results are obtained combining sequentially coherent measurements on fractional groups of particles.
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"abstract": "Scheme for optimal spin state estimation is considered in analogy with phase\ndetection in interferometry. Recently reported coherent measurements yielding\nthe average fidelity (N+1)/(N+2) for N particle system corresponds to the\nstandard limit of phase resolution 1/\\sqrt{N}. It provides the bound for\nincoherent measurements when each particle is detected separately and\ninformation is used optimally. For specific states, improvement up to the value\n1/N is possible in quantum theory. The best results are obtained combining\nsequentially coherent measurements on fractional groups of particles.",
"arxiv_id": "quant-ph/9911071",
"authors": [
"Z. Hradil",
"M. Dusek"
],
"categories": [
"quant-ph"
],
"doi": "10.1016/S0030-4018(00)00809-9",
"title": "Analogy between optimal spin estimation and interferometry",
"url": "https://arxiv.org/abs/quant-ph/9911071"
},
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