Hybrid noiseless subsystems for quantum communication over optical fibers

Abstract

We derive the general structure of noiseless subsystems for optical radiation contained in a sequence of pulses undergoing collective depolarization in an optical fiber. This result is used to identify optimal ways to implement quantum communication over a collectively depolarizing channel, which in general combine various degrees of freedom, such as polarization and phase, into joint hybrid schemes for protecting quantum coherence.

5 pages, 1 figure

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• Communication between general-relativistic observers without a shared reference frame
• Polarization and frequency disentanglement of photons via stochastic polarization mode dispersion
• Witnessing latent time correlations with a single quantum particle