dorsal/arxiv
View SchemaOn the Phase Covariant Quantum Cloning
| Authors | V. Karimipour, A. T. Rezakhani |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0208080 |
| URL | https://arxiv.org/abs/quant-ph/0208080 |
| DOI | 10.1103/PhysRevA.66.052111 |
| Journal | Phys. Rev. A 66, 052111 (2002) |
Abstract
It is known that in phase covariant quantum cloning the equatorial states on the Bloch sphere can be cloned with a fidelity higher than the optimal bound established for universal quantum cloning. We generalize this concept to include other states on the Bloch sphere with a definite $z$ component of spin. It is shown that once we know the $z$ component, we can always clone a state with a fidelity higher than the universal value and that of equatorial states. We also make a detailed study of the entanglement properties of the output copies and show that the equatorial states are the only states which give rise to separable density matrix for the outputs.
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"abstract": "It is known that in phase covariant quantum cloning the equatorial states on\nthe Bloch sphere can be cloned with a fidelity higher than the optimal bound\nestablished for universal quantum cloning. We generalize this concept to\ninclude other states on the Bloch sphere with a definite $z$ component of spin.\nIt is shown that once we know the $z$ component, we can always clone a state\nwith a fidelity higher than the universal value and that of equatorial states.\nWe also make a detailed study of the entanglement properties of the output\ncopies and show that the equatorial states are the only states which give rise\nto separable density matrix for the outputs.",
"arxiv_id": "quant-ph/0208080",
"authors": [
"V. Karimipour",
"A. T. Rezakhani"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.66.052111",
"journal_ref": "Phys. Rev. A 66, 052111 (2002)",
"title": "On the Phase Covariant Quantum Cloning",
"url": "https://arxiv.org/abs/quant-ph/0208080"
},
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