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"Towards optical quantum networks with Silicon-vacancy color centers"

Dr. Denis Sukachev
Harvard University


Optical quantum networks may have many applications in secure quantum communication, computation and metrology. Quantum networks require nodes which efficiently interface photons to registers of long-lived quantum memories which can be controlled with high fidelity. I will present a platform based on a silicon-vacancy-color-center (SiV) coupled to a nearby nuclear spin and embedded in a diamond nanocavity, which fulfills all of these requirements. The high cooperativity SiV-cavity system (C = 38) provides a deterministic interface between itinerant photons and the electron spin, with a coherence time exceeding 1 ms. Employing coherent microwave control, we generate high-fidelity spin-photon entanglement and implement heralded photon storage in the nanophotonic register. Finally, we demonstrate universal control over a cavity-coupled two-qubit register consisting of a SiV and a proximal 13C spin with coherence time approaching one second. These results pave the way for preparing of large 2D photonic cluster states and demonstration of first-generation quantum repeaters.

Tuesday, May 7, 2019
IQSE Seminar Room, 12:00 Noon
(578 MPHY)

Institute for Quantum Science and Engineering
Texas A&M University

Deli lunch to be served at 11:30 a.m.

Host: Dr. Marlan Scully