Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session V01: Poster Session III 4pm-6pm CDT
4:00 PM,
Thursday, June 3, 2021
Abstract: V01.00057 : A fast optimal control algorithm for quantum sensing
Presenter:
Santiago Hernández Gómez
(LENS/University of Florence and INO-CNR)
Authors:
Santiago Hernández Gómez
(LENS/University of Florence and INO-CNR)
Giovanni Fasiolo
(ICTP)
Paola Cappellaro
(Massachusetts Institute of Technology MIT)
Antonello Scardicchio
(ICTP)
Nicole Fabbri
(LENS/University of Florence and INO-CNR)
We introduce an innovative method to optimize the sensitivity of the NV center to time-varying magnetic fields, based on simulated quantum annealing. The method aims at finding optimal spin control protocols in the form of pulsed dynamical decoupling, to protect the sensor from noise while ensuring optimal coupling to the target signal. We show that the problem of extremizing the Fisher information of the sensing task can be mapped into a problem of energy minimization in a spin glass model, for which we implement a fast and robust quantum annealing algorithm.
We demonstrate that quantum annealing outperforms other optimal control algorithms in terms of noise protection and sensitivity achieved, as well as in terms of computational time.
We envisage that embedding this algorithm in a closed loop can further push the capabilities of the sensor to frequency identification on top of amplitude measurements.
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