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IEEE Electronic Components and Technology Conference (ECTC)

Quantum Fiber Optic Interconnect for Quantum Networks

Heng Loong Lee, Richard Pitwon

Published Jun 1, 2021• 1 citation
Publisher

Abstract

We report on the development and initial characterization of a new class of ultra-low loss, “quantum grade” optical interconnect technologies to address the emerging requirements of quantum networks.
DOI
10.1109/ectc32696.2021.00251

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A growing number of quantum communication protocols require entanglement distribution among remote parties, which is best accomplished by exploiting the mature technology and extensive infrastructure of low-loss optical fiber. For this reason, a practical source of entangled photons must be drop-in compatible with optical fiber networks. Here we demonstrate such a source for the first time, in which the nonlinearity of standard single-mode fiber is utilized to yield entangled photon pairs in the 1310-nm O-band. Using an ultra-stable design, we produce polarization entanglement with 98.0% +/- 0.5% fidelity to a maximally entangled state as characterized via coincidence-basis tomography. To demonstrate the source's drop-in capability, we transmit one photon from each entangled pair through a telecommunications-grade optical amplifier set to boost classical 1550-nm (C-band) communication signals. We verify that the photon pairs experience no measurable decoherence upon passing through the active amplifier (the output state's fidelity with a maximally entangled state is 98.4% +/- 1.4%).