A high-gain and high-fidelity coherent state comparison amplifier

Ross J. Donaldson, Luca Mazzarella, Robert John Collins, John Jeffers, Gerald Stuart Buller

Research output: Contribution to journalArticle

Abstract

Optical signals are subject to a distance-dependent loss as they propagate through transmission media. High-intensity, classical, optical signals can routinely be amplified to overcome the degradation caused by this loss. However, quantum optical states cannot be deterministically amplified and any attempt to do so will introduce intrinsic noise that spoils the desired quantum properties. Non-deterministic optical amplification, based on post-selection of the output depending on certain conditioning detection outcomes, is an emerging enabling technology in quantum measurement and quantum communications. Here we present an investigation into the properties of a simple, modular optical state comparison amplifier operating on weak coherent states. This amplifier requires no complex quantum resources and is based on linear optical components allowing for a high amplification rate at high gain and fidelity. We examine the amplifier’s performance in different configurations and develop an accurate analytical model that accounts for typical experimental scenarios.
LanguageEnglish
Article number54
Number of pages9
JournalCommunications Physics
Volume1
DOIs
Publication statusPublished - 12 Sep 2018

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high gain
amplifiers
optical communication
quantum communication
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emerging
resources
communication
degradation
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configurations

Cite this

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title = "A high-gain and high-fidelity coherent state comparison amplifier",
abstract = "Optical signals are subject to a distance-dependent loss as they propagate through transmission media. High-intensity, classical, optical signals can routinely be amplified to overcome the degradation caused by this loss. However, quantum optical states cannot be deterministically amplified and any attempt to do so will introduce intrinsic noise that spoils the desired quantum properties. Non-deterministic optical amplification, based on post-selection of the output depending on certain conditioning detection outcomes, is an emerging enabling technology in quantum measurement and quantum communications. Here we present an investigation into the properties of a simple, modular optical state comparison amplifier operating on weak coherent states. This amplifier requires no complex quantum resources and is based on linear optical components allowing for a high amplification rate at high gain and fidelity. We examine the amplifier’s performance in different configurations and develop an accurate analytical model that accounts for typical experimental scenarios.",
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A high-gain and high-fidelity coherent state comparison amplifier. / Donaldson, Ross J.; Mazzarella, Luca; Collins, Robert John; Jeffers, John; Buller, Gerald Stuart.

In: Communications Physics, Vol. 1, 54, 12.09.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A high-gain and high-fidelity coherent state comparison amplifier

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AU - Mazzarella, Luca

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AU - Buller, Gerald Stuart

PY - 2018/9/12

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