Abstract
Quantum parameter estimation is central to many fields such as quantum computation, communications and metrology. Optimal estimation theory has been instrumental in achieving the best accuracy in quantum parameter estimation, which is possible when we have very precise knowledge of and control over the model. However, uncertainties in key parameters underlying the system are unavoidable and may impact the quality of the estimate. We show here how quantum optical phase estimation of a squeezed state of light exhibits improvement when using a robust fixed-interval smoother designed with uncertainties explicitly introduced in parameters underlying the phase noise.
Highlights
Quantum parameter estimation [1] is the problem of estimating a classical variable of a quantum system
This work considered robust quantum phase estimation with explicitly modelled uncertainty introduced in the underlying system in a systematic state-space setting within the modern control theory paradigm
We constructed a robust fixed-interval smoother for continuous phase estimation of a squeezed state of light with uncertainty considered in the phase noise
Summary
Content from this work may be used under the Abstract terms of the Creative Quantum parameter estimation is central to many fields such as quantum computation, communica-. Optimal estimation theory has been instrumental in achieving the best accuracy. Any further distribution of in quantum parameter estimation, which is possible when we have very precise knowledge of and this work must maintain attribution to the control over the model. Uncertainties in key parameters underlying the system are author(s) and the title of the work, journal citation unavoidable and may impact the quality of the estimate. We show here how quantum optical phase and DOI. Estimation of a squeezed state of light exhibits improvement when using a robust fixed-interval smoother designed with uncertainties explicitly introduced in parameters underlying the phase noise
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