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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Photonic polarization gears for ultra-sensitive angular measurements
Vincenzo D'Ambrosio1, Nicolò Spagnolo, Lorenzo Del Re
1Dipartimento di Fisica, Sapienza Università di Roma, piazzale Aldo Moro 5, 00185 Roma, Italy.
Nature Communications
|September 19, 2013
Summary
This study introduces a
Area of Science:
- Quantum optics
- Metrology
- Photonics
Background:
- Quantum metrology promises enhanced precision but faces practical limitations.
- Classical and hybrid methods inspired by quantum concepts offer immediate value.
Purpose of the Study:
- To demonstrate a 'photonic gear' system for amplified angular measurements.
- To combine mechanical rotation amplification with quantum entanglement for improved precision.
- To achieve robust, high-precision angular measurements resistant to photon loss.
Main Methods:
- Generating NOON-like photonic states with high angular momentum (m up to 100).
- Utilizing a 'photonic gear' to amplify mechanical rotation (θ) into optical polarization rotation (mθ).
- Implementing a hybrid approach combining the gear effect with entanglement-enhanced quantum strategies.
Main Results:
- Achieved single-photon angular measurements with precision comparable to multi-photon quantum strategies.
- Demonstrated robustness against photon losses.
- Boosted optical non-contact angular measurement precision by nearly two orders of magnitude.
Conclusions:
- The 'photonic gear' offers a practical route to super-resolution in angular measurements.
- Hybrid approaches effectively leverage both classical amplification and quantum enhancement.
- This technology significantly advances the state-of-the-art in optical metrology.
