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Optimal Control for One-Qubit Quantum Sensing
- Source :
- Physical review. X 8 (2018). doi:10.1103/PhysRevX.8.021059, info:cnr-pdr/source/autori:Poggiali, F.; Cappellaro, P.; Fabbri, N./titolo:Optimal Control for One-Qubit Quantum Sensing/doi:10.1103%2FPhysRevX.8.021059/rivista:Physical review. X/anno:2018/pagina_da:/pagina_a:/intervallo_pagine:/volume:8, Physical Review X, Vol 8, Iss 2, p 021059 (2018), American Physical Society
- Publication Year :
- 2018
- Publisher :
- American Physical Society, College Park, Md. , Stati Uniti d'America, 2018.
-
Abstract
- Quantum systems can be exquisite sensors thanks to their sensitivity to external perturbations. This same characteristic also makes them fragile to external noise. Quantum control can tackle the challenge of protecting quantum sensors from environmental noise, while leaving their strong coupling to the target field to be measured. As the compromise between these two conflicting requirements does not always have an intuitive solution, optimal control based on numerical search could prove very effective. Here we adapt optimal control theory to the quantum sensing scenario, by introducing a cost function that, unlike the usual fidelity of operation, correctly takes into account both the unknown field to be measured and the environmental noise. We experimentally implement this novel control paradigm using a Nitrogen Vacancy center in diamond, finding improved sensitivity to a broad set of time varying fields. The demonstrated robustness and efficiency of the numerical optimization, as well as the sensitivity advantaged it bestows, will prove beneficial to many quantum sensing applications.
- Subjects :
- Physics
Quantum Physics
QC1-999
Quantum sensor
FOS: Physical sciences
General Physics and Astronomy
02 engineering and technology
021001 nanoscience & nanotechnology
Optimal control
Topology
01 natural sciences
Magnetic field
Qubit
0103 physical sciences
nitrogen-vacancy centers in diamond
Sensitivity (control systems)
quantum sensing
Quantum Physics (quant-ph)
010306 general physics
0210 nano-technology
quantum control
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Physical review. X 8 (2018). doi:10.1103/PhysRevX.8.021059, info:cnr-pdr/source/autori:Poggiali, F.; Cappellaro, P.; Fabbri, N./titolo:Optimal Control for One-Qubit Quantum Sensing/doi:10.1103%2FPhysRevX.8.021059/rivista:Physical review. X/anno:2018/pagina_da:/pagina_a:/intervallo_pagine:/volume:8, Physical Review X, Vol 8, Iss 2, p 021059 (2018), American Physical Society
- Accession number :
- edsair.doi.dedup.....0cb86e9fffae5c66b8ebb3831514943a