Dynamic control of noisy quantum memory channels

Goren Gordon; Gershon Kurizki

doi:10.1117/12.723952

12 June 2007 Dynamical control of noisy quantum memory channels

Goren Gordon, Gershon Kurizki

Proceedings Volume 6593, Photonic Materials, Devices, and Applications II; 65931S (2007) https://doi.org/10.1117/12.723952
Event: Microtechnologies for the New Millennium, 2007, Maspalomas, Gran Canaria, Spain

Abstract

Using quantum channels to transmit classical information has been proven to be advantageous in several scenarios. These channels have been assumed to be memoryless, meaning that consecutive transmissions of information are uncorrelated. However, as shown experimentally, such correlations do exist, and thereby retain memory of previous information. This memory complicates the protection of entangled-information transmission from decoherence. We have recently addressed these fundamental questions by developing a generalized master equation for multipartite entangled systems coupled to finite-temperature baths and subject to arbitrary external perturbations whose role is to provide dynamical protection from decay and decoherence. Here we explore and extend the foregoing strategy to quantum optical communication schemes wherein polarization-entangled photons traverse a bit-flip channel with temporal and spatial memory, such that the two channels experience cross-decoherence. We introduce a novel approach to the protection of the entangled information from decoherence in such schemes. It is based on selectively modulating the photon polarizations in each channel. We show that by applying selective modulation, one can independently control the symmetry and spatial memory attributes of the channel. We then explore the effects of these attributes on the channel capacity. Remarkably, we show that there is a nontrivial interplay between the effects of asymmetry and memory on the channel capacity.

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Goren Gordon and Gershon Kurizki "Dynamical control of noisy quantum memory channels", Proc. SPIE 6593, Photonic Materials, Devices, and Applications II, 65931S (12 June 2007); https://doi.org/10.1117/12.723952

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KEYWORDS

Modulation

Quantum communications

Quantum memory

Quantum information

Optical fibers

Correlation function

Optical communications

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