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Title: Magnetic field sensing beyond the standard quantum limit under the effect of decoherence

Abstract

Entangled states can potentially be used to outperform the standard quantum limit by which every classical sensor is bounded. However, entangled states are very susceptible to decoherence, and so it is not clear whether one can really create a superior sensor to classical technology via a quantum strategy which is subject to the effect of realistic noise. This paper presents an investigation of how a quantum sensor composed of many spins is affected by independent dephasing. We adopt general noise models including non-Markovian effects, and in these noise models the performance of the sensor depends crucially on the exposure time of the sensor to the field. We have found that, by choosing an appropriate exposure time within the non-Markovian time region, an entangled sensor does actually beat the standard quantum limit. Since independent dephasing is one of the most typical sources of noise in many systems, our results suggest a practical and scalable approach to beating the standard quantum limit.

Authors:
 [1];  [1];  [2];  [3]
  1. Department of Materials, University of Oxford, OX1 3PH (United Kingdom)
  2. (Singapore)
  3. Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543 (Singapore)
Publication Date:
OSTI Identifier:
22038586
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 84; Journal Issue: 1; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; MAGNETIC FIELDS; MARKOV PROCESS; NOISE; QUANTUM ENTANGLEMENT; SENSORS

Citation Formats

Matsuzaki, Yuichiro, Benjamin, Simon C., Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, and Fitzsimons, Joseph. Magnetic field sensing beyond the standard quantum limit under the effect of decoherence. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.012103.
Matsuzaki, Yuichiro, Benjamin, Simon C., Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, & Fitzsimons, Joseph. Magnetic field sensing beyond the standard quantum limit under the effect of decoherence. United States. doi:10.1103/PHYSREVA.84.012103.
Matsuzaki, Yuichiro, Benjamin, Simon C., Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, and Fitzsimons, Joseph. Fri . "Magnetic field sensing beyond the standard quantum limit under the effect of decoherence". United States. doi:10.1103/PHYSREVA.84.012103.
@article{osti_22038586,
title = {Magnetic field sensing beyond the standard quantum limit under the effect of decoherence},
author = {Matsuzaki, Yuichiro and Benjamin, Simon C. and Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543 and Fitzsimons, Joseph},
abstractNote = {Entangled states can potentially be used to outperform the standard quantum limit by which every classical sensor is bounded. However, entangled states are very susceptible to decoherence, and so it is not clear whether one can really create a superior sensor to classical technology via a quantum strategy which is subject to the effect of realistic noise. This paper presents an investigation of how a quantum sensor composed of many spins is affected by independent dephasing. We adopt general noise models including non-Markovian effects, and in these noise models the performance of the sensor depends crucially on the exposure time of the sensor to the field. We have found that, by choosing an appropriate exposure time within the non-Markovian time region, an entangled sensor does actually beat the standard quantum limit. Since independent dephasing is one of the most typical sources of noise in many systems, our results suggest a practical and scalable approach to beating the standard quantum limit.},
doi = {10.1103/PHYSREVA.84.012103},
journal = {Physical Review. A},
issn = {1050-2947},
number = 1,
volume = 84,
place = {United States},
year = {2011},
month = {7}
}