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Single-Shot Non-Gaussian Measurements for Optical Phase Estimation
1Center for Quantum Information and Control, Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA.
Physical Review Letters
|October 5, 2020
Summary
Researchers developed new single-shot optical phase estimation strategies. These methods surpass standard limits, approaching optimal precision for coherent states in quantum metrology.
Area of Science:
- Quantum Metrology
- Quantum Optics
- Information Science
Background:
- Accurate estimation of physical properties with minimal uncertainty is crucial in quantum metrology.
- Optical phase estimation, mapping physical parameters to light's phase, is vital for many metrological tasks.
- Single-shot phase measurements are necessary, but near-optimal methods for unknown coherent states are challenging.
Purpose of the Study:
- To propose and demonstrate novel single-shot measurement strategies for ab initio phase estimation of coherent states.
- To achieve phase estimation precision surpassing the heterodyne measurement limit.
- To approach the Cramer-Rao lower bound for coherent states.
Main Methods:
- Real-time optimization of coherent displacement operations.
- Single photon counting with photon number resolution.
- Fast feedback mechanisms integrated with adaptive measurement steps.
Main Results:
- Demonstrated single-shot phase estimation strategies exceeding the heterodyne measurement sensitivity limit.
- Achieved precision approaching the Cramer-Rao lower bound for coherent states across various optical powers.
- Performance was maintained without correcting for detection efficiency.
Conclusions:
- The developed strategies represent the most sensitive single-shot measurement of unknown phases in optical coherent states to date.
- These methods offer a significant advancement in quantum metrology for precise phase estimation.
- The approach is robust and effective even with moderate adaptive measurement steps.
