基于交叉相位调制制备四光子偏振纠缠态及其在隐形传态上的运用

利用克尔介质、偏振分束器、半波片和对强相干探测场的零拍探测,呈现了一个关于制备四光子偏振Diche态、GHZ态和W态的方案,当前量子光学实验技术条件均能有效满足该方案的要求.强的探测模相继和多个信号模光子相互作用,每次对于探测模而言,都会产生一个相位旋转.接下来,对探测模利用零拍探测,信号模可以投影得到想要的光子偏振纠缠态.此外,为了展现所制备的纠缠态作为重要的量子信息资源的价值,基于交叉相位调制进一步提出了一个隐形传送三光子偏振纠缠态的实验方案.

Preparation of Entangled Four-photon Polarization State and Its Application in Teleportation via Cross-Phase Modulation

A scheme is proposed for generating a four-photon polarized Dicke state, Greenberger-Horne-Zeilinger state, and W-type state. The scheme only uses Kerr medium, polarization beam splitters, half wave plates and homodyne measurement on the coherent light field, which can be efficiently achieved in quantum optical laboratories. Strong probe mode interacts successively with multiple signal-mode photons, each causing a conditional phase rotation in the probe mode. Subsequent homodyne measurement of the probe mode will project the signal mode photons into the desired entangled polarization-photon state. In addition, in order to show the power of prepared entanglement as a resource, we further propose an experimental scheme for teleporting an entangled three-photon polarization state, based on cross-phase modulation.