Caves Carlton M, Wódkiewicz Krzysztof
Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131-1156, USA.
Phys Rev Lett. 2004 Jul 23;93(4):040506. doi: 10.1103/PhysRevLett.93.040506. Epub 2004 Jul 22.
The non-negative Wigner function of all quantum states involved in teleportation of Gaussian states using the standard continuous-variable teleportation protocol means that there is a local realistic phase-space description of the process. This includes the coherent states teleported up to now in experiments. We extend the phase-space description to teleportation of non-Gaussian states using the standard protocol and conclude that teleportation of non-Gaussian pure states with a fidelity of 2/3 is a "gold standard" for this kind of teleportation.
使用标准连续变量量子隐形传态协议进行高斯态量子隐形传态时,所涉及的所有量子态的非负维格纳函数意味着该过程存在局部实在的相空间描述。这包括目前实验中所传送的相干态。我们将相空间描述扩展到使用标准协议进行非高斯态的量子隐形传态,并得出结论:保真度为2/3的非高斯纯态量子隐形传态是此类量子隐形传态的“黄金标准”。