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IEEE/LEOS Summer Topical Meetings

Low-loss all-optical quantum switching

Timothy M. Rambo, Kevin McCusker, Yuping Huang, Prem Kumar

Published Jul 1, 2013• 7 citations
Publisher

Abstract

We present a two-input, two-output, single-photon switch prototype that is capable of achieving insertion loss5 GHz.
DOI
10.1109/phosst.2013.6614561

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As the field of quantum communications matures and adopts larger network topologies, it will require switches capable of multiplexing and demultiplexing entangled photons between network nodes. Such switches will need to operate at high speeds, with low loss, and minimal signal-band noise, while also retaining the quantum state of the routed photons. We present an all-optical, fiber-based, dual-in, dual-out switch that has a switching window of 45 ps and an insertion loss of <;3.0 dB. In addition, the switch introduces minimal degradation to the quantum state of the routed entangled photons. As a test of the switch's utility, we demultiplex a single quantum channel from a 6.5-GHz dual-channel quantum data stream. The recovered quantum state exhibits a fidelity of 96.2%±1.2% with the prepared state.