dorsal/arxiv
View SchemaOptimal scheme for estimating a pure qubit state via local measurements
| Authors | E. Bagan, M. Baig, R. Munoz-Tapia |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0205026 |
| URL | https://arxiv.org/abs/quant-ph/0205026 |
| DOI | 10.1103/PhysRevLett.89.277904 |
| Journal | Phys. Rev. Lett. 89, 277904 (2002) |
Abstract
We present the optimal scheme for estimating a pure qubit state by means of local measurements on N identical copies. We give explicit examples for low N. For large N, we show that the fidelity saturates the collective measurement bound up to order 1/N. When the signal state lays on a meridian of the Bloch sphere, we show that this can be achieved without classical communication.
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"abstract": "We present the optimal scheme for estimating a pure qubit state by means of\nlocal measurements on N identical copies. We give explicit examples for low N.\nFor large N, we show that the fidelity saturates the collective measurement\nbound up to order 1/N. When the signal state lays on a meridian of the Bloch\nsphere, we show that this can be achieved without classical communication.",
"arxiv_id": "quant-ph/0205026",
"authors": [
"E. Bagan",
"M. Baig",
"R. Munoz-Tapia"
],
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"quant-ph"
],
"doi": "10.1103/PhysRevLett.89.277904",
"journal_ref": "Phys. Rev. Lett. 89, 277904 (2002)",
"title": "Optimal scheme for estimating a pure qubit state via local measurements",
"url": "https://arxiv.org/abs/quant-ph/0205026"
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