Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session G16: DQI Invited Session: Experimental Advances in Quantum Sensors and Sensing
11:15 AM–2:15 PM,
Tuesday, March 3, 2020
Room: 201
Sponsoring
Unit:
DQI
Chair: Kater Murch, Washington University, St. Louis
Abstract: G16.00003 : Efficient readout for ensembles of nitrogen vacancy centers in diamond
Presenter:
Danielle Braje
(MIT Lincoln Lab)
Author:
Danielle Braje
(MIT Lincoln Lab)
sensing, quantum information, and precision measurement. Defects in solids, such as the nitrogen-
vacancy color center in diamond, can be initialized into pure quantum states, can be coherently
controlled, and can have relatively long-lived quantum coherence at room temperature. Lack of high-
fidelity state readout, however, has so far limited the utility of solid-state quantum devices. Despite
extensive experimental effort (and significant progress in increasing fidelity in certain specialized
implementations), no universal, high-fidelity readout technique has been achieved for solid-state spin
ensembles. Here we demonstrate a novel, non-optical technique, which offers high-fidelity readout for any
solid-state spin defects with microwave-accessible transitions. By coupling ensembles of spins to a
microwave cavity, we show enhancement of the state-dependent dispersive shift produced by the
ensemble, allowing high-fidelity readout at room temperature. We demonstrate this technique by
employing an ensemble of nitrogen vacancy centers for magnetometry, achieving a sensitivity
unconstrained by optical photon shot noise and approaching the Johnson-Nyquist noise limit of the
system. These results pave a clear path to achieve unity readout fidelity of solid-state spin ensembles
through increased ensemble size, reduced spin-resonance linewidth, or improved cavity quality factor.
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