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A robust quantum receiver for phase shift keyed signals

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Mueller,  C. R.
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201126

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

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Citation

Mueller, C. R., & Marquardt, C. (2015). A robust quantum receiver for phase shift keyed signals. NEW JOURNAL OF PHYSICS, 17: 032003. doi:10.1088/1367-2630/17/3/032003.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-63F0-D
Abstract
The impossibility of perfectly discriminating non-orthogonal quantum states imposes far-reaching consequences both on quantum and classical communication schemes. We propose and numerically analyze an optimized quantum receiver for the discrimination of phase encoded signals. Our scheme outperforms the standard quantum limit and approaches the Helstrom bound for any signal power. The discrimination is performed via an optimized, feedback-mediated displacement prior to a photon counting detector. We provide a detailed analysis of the influence of excess noise and technical imperfections on the average error probability. The results demonstrate the receiver's robustness and show that it can outperform any classical receiver over a wide range of realistic parameters.