Environment-Assisted Precision Measurement
Abstract
We describe a method to enhance the sensitivity of precision measurements that takes advantage of the environment of a quantum sensor to amplify the response of the sensor to weak external perturbations. An individual qubit is used to sense the dynamics of surrounding ancillary qubits, which are in turn affected by the external field to be measured. The resulting sensitivity enhancement is determined by the number of ancillas that are coupled strongly to the sensor qubit; it does not depend on the exact values of the coupling strengths and is resilient to many forms of decoherence. The method achieves nearly Heisenberg-limited precision measurement, using a novel class of entangled states. We discuss specific applications to improve clock sensitivity using trapped ions and magnetic sensing based on electronic spins in diamond.
Additional Information
© 2011 American Physical Society. Received 10 January 2010; published 8 April 2011. This work was supported by the NSF, ITAMP, NIST, the Packard Foundation and the Danish National Research Foundation.Attached Files
Published - Goldstein2011p13642Phys_Rev_Lett.pdf
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Additional details
- Eprint ID
- 23519
- Resolver ID
- CaltechAUTHORS:20110502-111820322
- NSF
- Institute for Theoretical, Atomic, Molecular and Optical Physics (ITAMP)
- National Institute of Standards and Technology (NIST)
- David and Lucile Packard Foundation
- Danish National Research Foundation
- Created
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2011-05-03Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field