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Optica Publishing Group
  • 2017 Conference on Lasers and Electro-Optics Pacific Rim
  • (Optica Publishing Group, 2017),
  • paper s2873

Quantum Enhancement of Signal-to-noise Ratio for Arbitrary Coherent States Using Heralded Linear Amplifiers

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Abstract

We present an experimental enhancement of signal-to-noise ratio for arbitrary coherent states using a noise-reduced linear amplifier that profitably combines a heralded measurement-based noiseless linear amplifier and a deterministic linear amplifier. The concatenation of two amplifiers introduces the flexibility that allows one to reach the amplification with high gain for large input coherent amplitude. We demonstrate a signal transfer coefficient of Ts = 2.55 ± 0.08 from input to output, achieved with an amplification gain of 10.54. When Gaussian statistics is retained, our heralded amplifier obtained a signal transfer coefficient of Ts =1.10 ± 0.04. Our amplification scheme only relies on linear optics and post-selection algorithm, and therefore would be of great usage in loss-sensitive quantum information protocols.

© 2017 Optical Society of America

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