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Environment Assisted Precision Measurement · Around

2009

Environment Assisted Precision Measurement

Goldstein, G., Cappellaro, P., Maze, J. R. et al.

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We describe a method to enhance the sensitivity of precision measurements that takes advantage of a quantum sensor's environment to amplify its response 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.

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