Physics – Quantum Physics
Scientific paper
2008-01-05
Phys. Rev. A 77, 064301 (2008)
Physics
Quantum Physics
5 pages,3 figures
Scientific paper
A scheme is presented for realizing frequency-up conversion and a two-qubit quantum swap gate for intracavity fields. In the scheme, a V-type atomic ensemble prepared in their ground states collectively mediates the interaction between the two cavity modes. Under certain conditions, the cavity-field degree of freedom is decoupled from the atomic degrees of freedom, and the effective coupling strength between the two cavity modes scales up with $\sqrt{N}$ ($N$ is the number of atoms). The numerical simulation shows that the quantum swap gate still has a high fidelity under the influence of the atomic spontaneous emission and the decay of the cavity modes.
Guo Guang-Can
Lin Gong-Wei
Lin Xiu-Min
Ye Ming-Yong
Zou Xu-Bo
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