Physics – Quantum Physics
Scientific paper
2006-06-19
Phys. Rev. A 75, 012324 (2007)
Physics
Quantum Physics
24 pages, 8 figures; Corrected typos in fig6(b),(c) and references; Adding disscussion on experimental feasibility in the last
Scientific paper
10.1103/PhysRevA.75.012324
A system consisting of two single-mode cavities spatially separated and connected by an optical fiber and multiple two-level atoms trapped in the cavities is considered. If the atoms resonantly and collectively interact with the local cavity fields but there is no direct interaction between the atoms, we show that an ideal quantum state transfer and highly reliable quantum swap, entangling, and controlled-Z gates can be deterministically realized between the distant cavities. We find that the operation of state transfer and swap, entangling, and controlled-Z gates can be greatly speeded up as number of the atoms in the cavities increases. We also notice that the effects of spontaneous emission of atoms and photon leakage out of cavity on the quantum processes can also be greatly diminished in the multiatom case.
Li Fu-Li
Yin Zhang-qi
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