We study the model in which one of two entangled atoms interacts with a single mode cavity field based on the Jaynes Cummings model. Through measurement on the atom, the entanglement swapping can occur. It is proved...
详细信息
We study the model in which one of two entangled atoms interacts with a single mode cavity field based on the Jaynes Cummings model. Through measurement on the atom, the entanglement swapping can occur. It is proved that the squeezing may be greatly enhanced by conditional measurement on atoms.
九十年代以来,随着量子通信和量子计算的发展,人们发现纠缠是量子信息学中的最为重要的工具之一,它被广泛应用于量子隐形传态、量子密集编码、量子纠缠交换、量子密码等众多量子通信和量子计算过程之中。因此,有关量子纠缠态的制备、识别和测量也成为影响量子信息发展的重要环节。实验上最易实现的是参量下转换过程产生的双光子纠缠态,即 Bell 态。相应的识别和测量方面,使用线性光学元件无法识别全部四个 Bell 态,只有使用原子的双光子吸收等非线性过程才能实现完整的 Bell 态识别和测量。最近．两种采用非线性 Kerr 元件的测量方案被分别提出。这里,我们提出一种同样使用 Kerr 元件的非破坏性的 Bell 识别方案．并将这种方案推广到所有的偶数粒子 GHZ 态的非破坏性识别。
A pair of photons called signal and idler photons, respectively, are produced through the nonlinear process of type I spontaneous parametric down conversion in BBO crystal pumped by the second harmonic wave of a Ti...
详细信息
A pair of photons called signal and idler photons, respectively, are produced through the nonlinear process of type I spontaneous parametric down conversion in BBO crystal pumped by the second harmonic wave of a Ti∶sapphire femtosecond laser pulse. The two order interference phenomenon of the signal photon in Michelson interferometer is observed and give an analysis in detail.
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