Maxwell, AS;
Serafini, A;
Bose, S;
Faria, CFDM;
(2021)
Quantum estimation in strong fields: In situ ponderomotive sensing.
Physical Review A
, 103
(4)
, Article 043519. 10.1103/PhysRevA.103.043519.
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Abstract
We develop a theoretical framework to optimize and understand uncertainty from in situ strong-field measurements of laser field parameters. We present a derivation of quantum and classical Fisher information in attoscience for an electron undergoing strong-field ionization. This is used for parameter estimation and to characterize the uncertainty of the ponderomotive energy, directly proportional to laser intensity. In particular, the quantum and classical Fisher information for the momentum basis displays quadratic scaling over time. This can be linked to above-threshold ionization interference rings for measurements in the momentum basis and to a "ponderomotive phase"for the optimal quantum measurements. Preferential scaling in uncertainty is found for increasing laser pulse length and intensity. We use this to demonstrate for in situ measurements of laser intensity that high-resolution momentum spectroscopy has the capacity to reduce the uncertainty by more than 25 times compared to measurements employing the ionization rate, while using the optimal quantum measurement would reduce it by a further factor of 2.6. A minimum uncertainty of the order 2.8×10-3% is theorized for this framework. Finally, we examine previous in situ measurements, formulating a measurement that matches the experimental procedure, and suggest alterations to the measurement scheme that could reduce the laser intensity uncertainty.
| Type: | Article |
|---|---|
| Title: | Quantum estimation in strong fields: In situ ponderomotive sensing |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevA.103.043519 |
| Publisher version: | https://doi.org/10.1103/PhysRevA.103.043519 |
| 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. |
| 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/10127875 |
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