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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Transmission estimation at the quantum Cramér-Rao bound with macroscopic quantum light.

Timothy S Woodworth^1,2, Carla Hermann-Avigliano^3,4, Kam Wai Clifford Chan⁵

¹Homer L. Dodge Department of Physics and Astronomy, The University of Oklahoma, Norman, Oklahoma 73019 USA.

EPJ Quantum Technology

|December 27, 2022

Summary

Quantum metrology enhances sensing precision using quantum resources. Experiments achieved the quantum limit for transmission estimation, reducing variance by 62% with bright two-mode squeezed states.

Keywords:

Quantum Cramér-Rao bound Quantum Fisher information Quantum metrology Quantum optics Quantum sensing Transmission estimation

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Area of Science:

Quantum physics
Metrology
Quantum optics

Background:

Quantum metrology aims to surpass classical sensing limits using quantum phenomena.
The quantum Cramér-Rao bound sets the theoretical precision limit for parameter estimation.
Practical implementation requires experimental methods to reach this quantum bound.

Purpose of the Study:

To experimentally saturate the quantum Cramér-Rao bound for transmission estimation.
To investigate the use of continuous wave bright two-mode squeezed states for enhanced sensing.
To account for experimental imperfections in quantum state generation.

Main Methods:

Probing a system with a bright two-mode squeezed state.
Performing transmission estimation experiments.
Extending theoretical models to include measured properties of the generated quantum state.

Main Results:

Experimental saturation of the quantum Cramér-Rao bound across a range of transmissions.
A 62% reduction in variance for transmission estimation at 84% transmission.
Demonstrated precision using a bright two-mode squeezed state with -8 dB squeezing.

Conclusions:

The study experimentally validates the use of quantum states for surpassing classical sensing limits.
Achieved precision in transmission estimation has broad implications for various sensing applications.
This work paves the way for practical quantum-enhanced measurement technologies.