Max Planck Institute for the Science of Light, Günther-Scharowsky-Strasse 1, Bau 24, 91058, Erlangen, Germany.
Phys Rev Lett. 2010 Mar 12;104(10):100505. doi: 10.1103/PhysRevLett.104.100505.
We experimentally demonstrate a new measurement scheme for the discrimination of two coherent states. The measurement scheme is based on a displacement operation followed by a photon-number-resolving detector, and we show that it outperforms the standard homodyne detector which we, in addition, prove to be optimal within all Gaussian operations including conditional dynamics. We also show that the non-Gaussian detector is superior to the homodyne detector in a continuous variable quantum key distribution scheme.
我们实验演示了一种用于区分两种相干态的新测量方案。该测量方案基于位移操作和光子计数分辨探测器，我们表明它优于标准的外差探测器，此外，我们还证明了在外差探测器包括条件动力学在内的所有高斯操作中都是最优的。我们还表明，在连续变量量子密钥分发方案中，非高斯探测器优于外差探测器。
