Environment-assisted precision measurement

Publikation: Bidrag til tidsskriftTidsskriftartikelfagfællebedømt

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
TidsskriftPhysical Review Letters
Udgave nummer14
Sider (fra-til)140502
Antal sider4
StatusUdgivet - 8 apr. 2011

ID: 33234902