TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.17.1.004
TI  - Optimal control of a quantum sensor: A fast algorithm based on an analytic solution
PY  - 2024/07/04
UR  - https://scipost.org/SciPostPhys.17.1.004
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 17
IS  - 1
SP  - 004
A1  - Hernández-Gómez, Santiago
AU  - Balducci, Federico
AU  - Fasiolo, Giovanni
AU  - Cappellaro, Paola
AU  - Fabbri, Nicole
AU  - Scardicchio, Antonello
AB  - 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.
ER  -

@Article{10.21468/SciPostPhys.17.1.004,
	title={{Optimal control of a quantum sensor: A fast algorithm based on an analytic solution}},
	author={Santiago Hernández-Gómez and Federico Balducci and Giovanni Fasiolo and Paola Cappellaro and Nicole Fabbri and Antonello Scardicchio},
	journal={SciPost Phys.},
	volume={17},
	pages={004},
	year={2024},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.17.1.004},
	url={https://scipost.org/10.21468/SciPostPhys.17.1.004},
}