Benchmarking the state comparison amplifier

Klaudia Kleczkowska, Ittoop Vergheese Puthoor, Lauren Bain, and Erika Andersson
Phys. Rev. A 96, 042309 – Published 9 October 2017

Abstract

The state comparison amplifier is a recently proposed probabilistic quantum amplifier, intended especially for amplifying coherent states. Its realization is simple and uses only linear optics and photodetectors, and the preparation of a “guess” state, typically a coherent state. Fidelity and success probability can be high compared with other probabilistic amplifiers. State comparison amplification does, however, extract information about the amplified state, which means that it is especially important to benchmark it against a simple measure-and-resend procedure. We compare state comparison quantum amplifiers to measure-and-resend strategies, and identify parameter regimes and scenarios where these can and where they cannot provide an advantage.

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  • Received 19 July 2017

DOI:https://doi.org/10.1103/PhysRevA.96.042309

©2017 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Klaudia Kleczkowska, Ittoop Vergheese Puthoor, Lauren Bain, and Erika Andersson

  • Institute of Photonics and Quantum Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom

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Issue

Vol. 96, Iss. 4 — October 2017

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