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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Detection of Quantum Interference without an Interference Pattern
Iliya Esin1, Alessandro Romito2, Yuval Gefen3
1Physics Department, Technion, 3200003 Haifa, Israel.
Physical Review Letters
|July 24, 2020
Summary
This study introduces a new method to confirm quantum interference without changing interferometer settings. The technique distinguishes quantum interference from classical phenomena, offering a novel way to verify quantum effects.
Area of Science:
- Quantum mechanics
- Condensed matter physics
- Quantum optics
Background:
- Quantum interference is typically verified by observing signal changes with varying parameters.
- Which-path measurements demonstrate quantum effects by destroying interference.
Purpose of the Study:
- To develop a novel measurement protocol for certifying quantum interference.
- To distinguish quantum interference from classical interference without parameter variation.
- To implement the protocol using an electronic Mach-Zehnder interferometer.
Main Methods:
- Measuring cross-correlations between weak which-path detectors and interferometer drain current.
- Utilizing an electronic Mach-Zehnder interferometer with electrostatically coupled quantum point contacts as detectors.
Main Results:
- The protocol certifies interference without needing to vary interferometer parameters.
- The method successfully distinguishes quantum interference, yielding a null result for classical interference.
- Demonstrates feasibility with an electronic Mach-Zehnder interferometer setup.
Conclusions:
- A new protocol is presented for certifying quantum interference and its quantum nature.
- This method bypasses the need for controlled parameter variation in interferometers.
- The findings have implications for verifying quantum phenomena in solid-state devices.
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