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Demonstration of Coherent-State Discrimination Using a Displacement-Controlled Photon-Number-Resolving Detector

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Wittmann,  Christoffer
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Andersen,  Ulrik L.
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Sych,  Denis
Optics Theory Group, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Leuchs,  Gerd
Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Wittmann, C., Andersen, U. L., Takeoka, M., Sych, D., & Leuchs, G. (2010). Demonstration of Coherent-State Discrimination Using a Displacement-Controlled Photon-Number-Resolving Detector. PHYSICAL REVIEW LETTERS, 104(10): 100505. doi:10.1103/PhysRevLett.104.100505.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-6B19-8
Abstract
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.