dorsal/arxiv
View SchemaOptimal measurements for relative quantum information
| Authors | Stephen D. Bartlett, Terry Rudolph, Robert W. Spekkens |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0310009 |
| URL | https://arxiv.org/abs/quant-ph/0310009 |
| DOI | 10.1103/PhysRevA.70.032321 |
| Journal | Phys. Rev. A 70, 032321 (2004) |
Abstract
We provide optimal measurement schemes for estimating relative parameters of the quantum state of a pair of spin systems. We prove that the optimal measurements are joint measurements on the pair of systems, meaning that they cannot be achieved by local operations and classical communication. We also demonstrate that in the limit where one of the spins becomes macroscopic, our results reproduce those that are obtained by treating that spin as a classical reference direction.
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"abstract": "We provide optimal measurement schemes for estimating relative parameters of\nthe quantum state of a pair of spin systems. We prove that the optimal\nmeasurements are joint measurements on the pair of systems, meaning that they\ncannot be achieved by local operations and classical communication. We also\ndemonstrate that in the limit where one of the spins becomes macroscopic, our\nresults reproduce those that are obtained by treating that spin as a classical\nreference direction.",
"arxiv_id": "quant-ph/0310009",
"authors": [
"Stephen D. Bartlett",
"Terry Rudolph",
"Robert W. Spekkens"
],
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"quant-ph"
],
"doi": "10.1103/PhysRevA.70.032321",
"journal_ref": "Phys. Rev. A 70, 032321 (2004)",
"title": "Optimal measurements for relative quantum information",
"url": "https://arxiv.org/abs/quant-ph/0310009"
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