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arXiv · 1810.12821

Telecom-band quantum optics with ytterbium atoms and silicon nanophotonics

Jacob P. Covey·Alp Sipahigil·Szilard Szoke·Neil Sinclair·Manuel Endres·Oskar Painter
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Abstract

Wavelengths in the telecommunication window (~1.25-1.65 microns) are ideal for quantum communication due to low transmission loss in fiber networks. To realize quantum networks operating at these wavelengths, long-lived quantum memories that couple to telecom-band photons with high efficiency need to be developed. We propose coupling neutral ytterbium atoms, which have a strong telecom-wavelength transition, to a silicon photonic crystal cavity. Specifically, we consider the 3P0-3D1 transition in neutral 171Yb to interface its long-lived nuclear spin in the metastable 3P0 'clock' state with a telecom-band photon at 1.4 microns. We show that Yb atoms can be trapped using a short wavelength (~470 nm) tweezer at a distance of 350 nm from the silicon photonic crystal cavity. At this distance, due to the slowly decaying evanescent cavity field at a longer wavelength, we obtain a single-photon Rabi frequency of g/(2pi)~100 MHz and a cooperativity of C~47 while maintaining a high photon collection efficiency into a single mode fiber. The combination of high system efficiency, telecom-band operation, and long coherence times makes this platform well suited for quantum optics on a silicon chip and long-distance quantum communication.

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Jacob P. Covey, Alp Sipahigil, Szilard Szoke, Neil Sinclair, Manuel Endres, Oskar Painter. 2018-10-30. Telecom-band quantum optics with ytterbium atoms and silicon nanophotonics. https://doi.org/10.1103/physrevapplied.11.034044

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