Towards Einstein-Podolsky-Rosen quantum channel multiplexing - Quantum PhysicsReport as inadecuate

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Abstract: A single broadband squeezed field constitutes a quantum communicationresource that is sufficient for the realization of a large number N of quantumchannels based on distributed Einstein-Podolsky-Rosen EPR entangled states.Each channel can serve as a resource for, e.g. independent quantum keydistribution or teleportation protocols. N-fold channel multiplexing can berealized by accessing 2N squeezed modes at different Fourier frequencies. Wereport on the experimental implementation of the N=1 case through theinterference of two squeezed states, extracted from a single broadband squeezedfield, and demonstrate all techniques required for multiplexing N>1. Quantumchannel frequency multiplexing can be used to optimize the exploitation of abroadband squeezed field in a quantum information task. For instance, it isuseful if the bandwidth of the squeezed field is larger than the bandwidth ofthe homodyne detectors. This is currently a typical situation in manyexperiments with squeezed and two-mode squeezed entangled light.

Author: Boris Hage, Aiko Samblowski, Roman Schnabel


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