dorsal/arxiv
View SchemaPhase covariant quantum cloning
| Authors | D. Bruss, M. Cinchetti, G. M. D'Ariano, C. Macchiavello |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/9909046 |
| URL | https://arxiv.org/abs/quant-ph/9909046 |
| DOI | 10.1103/PhysRevA.62.012302 |
| Journal | Phys. Rev. A 62, 12302 (2000) |
Abstract
We consider an N -> M quantum cloning transformation acting on pure two-level states lying on the equator of the Bloch sphere. An upper bound for its fidelity is presented, by establishing a connection between optimal phase covariant cloning and phase estimation. We give the explicit form of a cloning transformation that achieves the bound for the case N=1, M=2, and find a link between this case and optimal eavesdropping in the quantum cryptographic scheme BB84.
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"abstract": "We consider an N -\u003e M quantum cloning transformation acting on pure two-level\nstates lying on the equator of the Bloch sphere. An upper bound for its\nfidelity is presented, by establishing a connection between optimal phase\ncovariant cloning and phase estimation. We give the explicit form of a cloning\ntransformation that achieves the bound for the case N=1, M=2, and find a link\nbetween this case and optimal eavesdropping in the quantum cryptographic scheme\nBB84.",
"arxiv_id": "quant-ph/9909046",
"authors": [
"D. Bruss",
"M. Cinchetti",
"G. M. D\u0027Ariano",
"C. Macchiavello"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.62.012302",
"journal_ref": "Phys. Rev. A 62, 12302 (2000)",
"title": "Phase covariant quantum cloning",
"url": "https://arxiv.org/abs/quant-ph/9909046"
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