Purification of entangled states for two atoms via cavity decay

Yan-Lin Liao, Yan Zhao

Zheng Shi-Biao

In this paper a scheme is proposed for the purification of entangled states for two atoms trapped in two distant cavities via cavity decay. In the scheme, the atoms have no probability of being populated in the excited state and thus the atomic spontaneous emission is suppressed. This scheme is valid no matter when the cavity decay rate is larger or smaller than the effective atom-cavity coupling strength. The fidelity of the final state is not affected by the imperfection of the photodetectors.

Yangming, SONGWei, LIYingqun +2 more

任世佳 REN Shi-jia, 张寿 ZHANG Shou

We propose a multipartite entanglement purification protocol(MEPP) for photonic entangled states using low-Q cavities.In our MEPP,the multipartite photonic entangled states can be purified with the two steps,i.e.,bit-flip error correction and phase-flip error correction.We can repeat these two steps to get a hight-fidelity entangled photonic states.By the single photon input-output process regarding the low-Q cavity containing an atom,the parity of photonic polarization state can be nondestructive detect.Different from other photonic MEPPs,Our MEPP are nondestructive and feasible in current experiment conditions.

廖庆洪, 方光宇, 王月媛 +2 more

Xiu‐Min Lin

A scheme is proposed for implementing entanglement purification with trapped atoms through adiabatic passage and detecting the photon decays from the cavities. The scheme is robust against certain noise such as atomic spontaneous emission and the detector inefficiency.