Quantum Estimation in Strong Fields: in situ ponderomotive sensing
- URL: http://arxiv.org/abs/2008.10070v2
- Date: Wed, 31 Mar 2021 16:32:29 GMT
- Title: Quantum Estimation in Strong Fields: in situ ponderomotive sensing
- Authors: A. S. Maxwell, A. Serafini, S. Bose, C. Figueira de Morisson Faria
- Abstract summary: We develop a new framework to optimize and understand uncertainty from in situ strong field measurements of laser field parameters.
We present the first derivation of quantum and classical Fisher information for an electron undergoing strong-field ionization.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We develop a new framework to optimize and understand uncertainty from in
situ strong field measurements of laser field parameters. We present the first
derivation of quantum and classical Fisher information 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 the `ponderomotive phase' for the
`ideal' quantum measurements. Preferential scaling 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 over $25$ times compared to
measurements employing the ionization rate, while using the `ideal' quantum
measurement would reduce it by a further factor of $2.6$. A minimum uncertainty
of the order $2.8 \times 10^{-3}~\%$ is theorized for this framework. Finally,
we examine previous in situ measurements formulating a measurement that matches
the experimental procedure and suggest how to improve this.
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