Loss asymmetries in quantum travelling wave parametric amplifiers

We study theoretically how loss impacts the amplification and squeezing performance of a generic quantum travelling wave parametric amplifier. Unlike previous studies, we analyze how having different levels of loss at signal and idler frequencies can dramatically alter properties compared to the cas...

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Bibliographic Details
Published in:arXiv.org 2018-09
Main Authors: Houde, M, Govia, L C G, Clerk, A A
Format: Article
Language:English
Subjects:
Asymmetry
Compressing
Parametric amplifiers
Quadratures
Traveling waves
Online Access:Get full text
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Summary:We study theoretically how loss impacts the amplification and squeezing performance of a generic quantum travelling wave parametric amplifier. Unlike previous studies, we analyze how having different levels of loss at signal and idler frequencies can dramatically alter properties compared to the case of frequency-independent loss. We find that loss asymmetries increase the amplifier's added noise in comparison to the symmetric loss case. More surprisingly, even small levels of loss asymmetry can completely destroy any quantum squeezing of symmetric collective output quadratures, while nonetheless leaving the output state strongly entangled.
ISSN:2331-8422
DOI:10.48550/arxiv.1809.07418