通过非决定性光子减法改进隐形传态
Teleportation improvement by inconclusive photon subtraction
摘要：
非决定性光子减法（IPS）是一种有条件的测量方案，以强制非线性演化的一个给定的状态。在IPS中，输入态在分束器中与真空混合，然后反射光束通过ON/OFF光电探测器显示。当探测器点击时，我们有（不确定的）光子减去状态。我们表明，IPS的纠缠双光束的两个通道上的辐射提高了保真度的相干态隐形传态，如果入射的双光束的能量低于一定的阈值，这取决于分束器transmittance和光电探测器的量子效率。我们表明，当透射率和效率接近单位时，能量阈值发散，并将我们的结果与以前的工作{ \em conclusive}光子减法。
英文摘要：
Inconclusive photon subtraction (IPS) is a conditional measurement scheme to force nonlinear evolution of a given state. In IPS the input state is mixed with the vacuum in a beam splitter and then the reflected beam is revealed by ON/OFF photodetection. When the detector clicks we have the (inconclusive) photon subtracted state. We show that IPS on both channels of an entangled twin-beam of radiation improves the fidelity of coherent state teleportation if the energy of the incoming twin-beam is below a certain threshold, which depends on the beam splitter transmissivity and the quantum efficiency of photodetectors. We show that the energy threshold diverges when the transmissivity and the efficiency approach unit and compare our results with that of previous works on {\em conclusive} photon subtraction.
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