Optimal control of a quantum sensor: A fast algorithm based on an analytic solution
Santiago Hernández-Gómez, Federico Balducci, Giovanni Fasiolo, Paola Cappellaro, Nicole Fabbri, Antonello Scardicchio
SciPost Phys. 17, 004 (2024) · published 4 July 2024
- doi: 10.21468/SciPostPhys.17.1.004
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Abstract
Quantum sensors can show unprecedented sensitivities, provided they are controlled in a very specific, optimal way. Here, we consider a spin sensor of time-varying fields in the presence of dephasing noise, and we show that the problem of finding the pulsed control field that optimizes the sensitivity (i.e., the smallest detectable signal) can be mapped to the determination of the ground state of a spin chain. We find an approximate but analytic solution of this problem, which provides a lower bound for the sensitivity and a pulsed control very close to optimal, which we further use as initial guess for realizing a fast simulated annealing algorithm. We experimentally demonstrate the sensitivity improvement for a spin-qubit magnetometer based on a nitrogen-vacancy center in diamond.
Cited by 1
Authors / Affiliations: mappings to Contributors and Organizations
See all Organizations.- 1 2 3 Santiago Hernández-Gómez,
- 4 5 6 Federico Balducci,
- 7 Giovanni Fasiolo,
- 2 Paola Cappellaro,
- 1 8 Nicole Fabbri,
- 4 5 Antonello Scardicchio
- 1 Laboratorio europeo di spettroscopia non lineare / European Laboratory for Non-Linear Spectroscopy [LENS]
- 2 Massachusetts Institute of Technology [MIT]
- 3 Università degli Studi di Firenze / University of Florence [UniFI]
- 4 Centro Internazionale di Fisica Teorica Abdus Salam / Abdus Salam International Centre for Theoretical Physics [ICTP]
- 5 INFN Sezione di Trieste / INFN Trieste
- 6 Scuola Internazionale Superiore di Studi Avanzati / International School for Advanced Studies [SISSA]
- 7 Università degli Studi di Trieste / University of Trieste [UNITS]
- 8 Istituto Nazionale di Ottica del Consiglio Nazionale delle Ricerche