Loss asymmetries in quantum travelling wave parametric amplifiers
Quantum Physics
2019-10-02 v1 Mesoscale and Nanoscale Physics
Abstract
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.
Keywords
Cite
@article{arxiv.1809.07418,
title = {Loss asymmetries in quantum travelling wave parametric amplifiers},
author = {M. Houde and L. C. G. Govia and A. A. Clerk},
journal= {arXiv preprint arXiv:1809.07418},
year = {2019}
}
Comments
11 pages, 7 figures, 3 pages appendix