Predko, A;
Albarelli, F;
Serafini, A;
(2020)
Time-local optimal control for parameter estimation in the Gaussian regime.
Physics Letters A
, 384
(13)
, Article 126268. 10.1016/j.physleta.2020.126268.
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Abstract
Information about a classical parameter encoded in a quantum state can only decrease if the state undergoes a non-unitary evolution, arising from the interaction with an environment. However, instantaneous control unitaries may be used to mitigate the decrease of information caused by an open dynamics. A possible, locally optimal (in time) choice for such controls is the one that maximises the time-derivative of the quantum Fisher information (QFI) associated with a parameter encoded in an initial state. In this study, we focus on a single bosonic mode subject to a Markovian, thermal master equation, and determine analytically the optimal time-local control of the QFI for its initial squeezing angle (optical phase) and strength. We show that a single initial control operation is already optimal for such cases and quantitatively investigate situations where the op
| Type: | Article |
|---|---|
| Title: | Time-local optimal control for parameter estimation in the Gaussian regime |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.physleta.2020.126268 |
| Publisher version: | https://doi.org/10.1016/j.physleta.2020.126268 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | Quantum control, Quantum estimation, Squeezing |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10109827 |
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