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Frontiers in Optics

Quantum frequency conversion

Colin J. McKinstrie

Published Jan 1, 2013• 0 citations
Publisher

Abstract

I will review the physics of optical amplifiers and frequency convertors, and explain how to frequency convert a signal without adding excess noise, or otherwise distorting its quantum state. I also will review recent experiments briefly.
DOI
10.1364/fio.2013.fm4d.1

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In this paper, studies are made of the information efficiencies of optical amplifiers, attenuators, and frequency convertors. Attenuators always reduce the amount of information carried by a signal. In contrast, parametric amplifiers and frequency convertors redistribute information between the signal and idler sidebands, but preserve the total information. Homodyne detection of the sideband quadratures degrades their signal-to-noise ratios. Detection always reduces the back-to-back and converted information capacities by moderate amounts, which do not depend on how the input information is encoded. The effects of detection on the amplified information capacity can be small or large, depending on how the input information is encoded. For (standard) two-sideband amplifiers, it is best to encode correlated information in both sidebands.
The quantum properties of optical devices are important • In conventional optical communication systems, quantum effects are responsible for noise inherent in the si (by amplifiers and attenuators) and noise in the detectors. gnals, noise added during transmission • Noise obscures the signals and lowers the information capacities. • There are many schemes for quantum communication and computation that rely on the quantum properties of light. • • Examples include quantum key distribution (QKD) and linear optical quantum computation (LOQC). • Common requirements for quantum information experiments include photon generators (singlet or pair) and (distortionless) photon frequency-convertors.