Reduced decoherence using squeezing, amplification, and antisqueezing
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Type of Work11 pages
Citation of Original PublicationR. A. Brewster, T. B. Pittman, and J. D. Franson, Reduced decoherence using squeezing, amplification, and antisqueezing, Phys. Rev. A 98, 033818 (2018), DOI:https://doi.org/10.1103/PhysRevA.98.033818
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©2018 American Physical Society
Loss and decoherence are major problems in the transmission of nonclassical states of light over large distances. It was recently shown that the effects of decoherence can be reduced by applying a probabilistic noiseless attenuator before transmitting a quantum state through a lossy channel, followed by probabilistic noiseless amplification [M. Micuda, I. Straka, M. Mikova, M. Dusek, N. J. Cerf, J. Fiurasek, and M. Jezek, Phys. Rev. Lett. 109, 180503 (2012)]. Here we show that similar results can be obtained for certain kinds of macroscopic quantum states by squeezing the signal before transmission, followed by deterministic amplification and antisqueezing to restore the original amplitude of the state. This approach can greatly reduce the effects of decoherence in the transmission of non-Gaussian states, such as Schrödinger cat states, without any reduction in the data transmission rate.