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Trapped Ion Quantum Computing
Variational Limits for Phase Precision in Linear Quantum Optical Metrology
arXiv
Authors: Yang Gao, Rumin Wang
Year
2015
Paper ID
26504
Status
Preprint
Abstract Read
~2 min
Abstract Words
97
Citations
N/A
Abstract
We apply the variational method to obtain the universal and analytical lower bounds for parameter precision in some noisy systems. We first derive a lower bound for phase precision in lossy optical interferometry at non-zero temperature. Then we consider the effect of both amplitude damping and phase diffusion on phase-shift precision. At last, we extend the constant phase estimation to the case of continuous fluctuating phase estimation, and find that due to photon losses the corresponding mean square error transits from the stochastic Heisenberg limit to the stochastic standard quantum limit as the total photon flux increases.
Why This Paper Matters
- This paper contributes to the Trapped-Ion Quantum Computing research area in the Quantum Articles archive.
- It adds a 2015 reference point for readers tracking recent quantum research.
- We apply the variational method to obtain the universal and analytical lower bounds for parameter precision in some noisy systems.
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