|
related topics |
{states, state, optimal} |
{cos, sin, state} |
{state, phys, rev} |
{state, states, entangled} |
{phase, path, phys} |
{spin, pulse, spins} |
{level, atom, field} |
{observables, space, algebra} |
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On the Phase Covariant Quantum Cloning
V. Karimipour, A. T. Rezakhani
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.
- oai_identifier:
- oai:arXiv.org:quant-ph/0208080
- categories:
- quant-ph
- comments:
- Revtex4, 6 pages, 5 eps figures
- doi:
- 10.1103/PhysRevA.66.052111
- arxiv_id:
- quant-ph/0208080
- journal_ref:
- Phys. Rev. A 66, 052111 (2002)
- created:
- 2002-08-13
- updated:
- 2002-09-07
Full article ▸
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