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Updated: Feb 21, 2026

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Orbital-angular-momentum spectrum characterization of continuous-variable entanglement via the phase-shift
Optics Express
|February 20, 2026
Summary
Researchers demonstrated a new method for measuring orbital angular momentum (OAM) in quantum beams. This technique, phase-shifting interferometry, accurately characterizes OAM spectra for enhanced quantum information capacity.
Area of Science:
- Quantum Optics
- Quantum Information Science
Background:
- Light possesses both spin angular momentum (SAM) and orbital angular momentum (OAM).
- OAM offers a new degree of freedom for expanding classical and quantum information capacity.
- Generating OAM-multiplexed continuous-variable entanglement via four-wave mixing (FWM) is key for quantum information channels.
Purpose of the Study:
- To present the first experimental demonstration of OAM spectrum measurement in quantum optics.
- To enable accurate characterization of OAM spectra in quantum beams for quantum information applications.
Main Methods:
- Utilized phase-shifting interferometry (PSI) for OAM spectrum measurement.
- Applied PSI to probe and conjugate beams in OAM-multiplexed continuous-variable entanglement generated via FWM.
Main Results:
- Successfully demonstrated experimental OAM spectrum measurement using PSI.
- Achieved accurate characterization of OAM spectra for both probe and conjugate beams.
Conclusions:
- PSI provides a reliable method for OAM spectrum measurement in quantum optics.
- This technique supports the utilization of multiplexed OAM in quantum communication and information processing.
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