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Nonlinear and nonlinear-linear hybrid interferometers using coherent and squeezed vacuum states
Optics Express
|January 29, 2025
Summary
Nonlinear interferometers enhance precision measurements by combining classical and quantum states. These systems show resilience to photon loss, outperforming hybrid designs for quantum-enhanced interferometry.
Area of Science:
- Quantum optics
- Interferometry
- Precision measurement
Background:
- Classical and quantum states are crucial for high-precision interferometry.
- Coherent and squeezed vacuum states are promising candidates for quantum-enhanced interferometry.
Purpose of the Study:
- Compare nonlinear and nonlinear-linear hybrid interferometers with homodyne detection.
- Analyze the impact of photon loss on phase sensitivity.
Main Methods:
- Utilized homodyne detection as a readout strategy.
- Investigated high-photon coherent states in different interferometer configurations.
- Simulated the effects of photon loss during transmission and readout.
Main Results:
- Both interferometer types approach the quantum Cramer-Rao bound for high-photon coherent states.
- Nonlinear interferometers demonstrate an advantage over nonlinear-linear hybrid designs.
- Maximal tolerable loss approaches 50% for phase sensitivity beyond the shot-noise limit with increasing photon number.
Conclusions:
- Nonlinear interferometers offer superior performance in quantum-enhanced metrology.
- Understanding the impact of photon loss is critical for practical applications.
- This research deepens insights into nonlinear dynamics for quantum interferometry.
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