摘要
为 teleporting 的计划一个未知 single-qubit photonic 状态被重游。在量 nonde-molition 大小的帮助下，计划现在能以一个几乎确定的方法被完成。weak-cross-Kerrnonlinearities-based 量 nondemolition 测量象钟状态分析器一样充当 entangler，并且因此在远距传物过程作为 CNOT 门起一个类似的作用。这改进用 nonunitary 使现在的计划比计划更有效射影的大小并且与当前的试验性的技术可行。
Scheme for teleporting an unknown single-qubit photonic state is revisited. With the help of quantum nondemolition measurements, the scheme now can be achieved in an almost deterministic way. The weak-cross-Kerr-nonlinearities-based quantum nondemolition measurement acts as an entangler as well as the Bell-state analyzer, and thus plays a similar role as the CNOT gate in the teleportation process. This improvement makes the present scheme more efficient than the schemes using nonunitary projective measurements and feasible with the current experimental technology.
基金
Supported by the National Natural Science Foundation of China under Grant Nos 10704001 and 60678022, the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No 20060357008, Anhui Provincial Natural Science Foundation under Grant No 070412060, the Key Program of the Education Department of Anhui Province under Grant Nos KJ2008B265, 2008jq1183 and KJ2008A28ZC, and the Talent Foundation of Anhui University. We would like to thank Dr. Zheng-Yuan Xue for careful reading of the initial version of the manuscript.
