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Updated: May 13, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Which-path information of path-polarization hybrid state in polarization-based nested Mach-Zehnder interferometer
Danbi Kim1, Minsu Kim2, Han Seb Moon3,4
1Department of Physics, Pusan National University, Geumjeong-Gu, Busan, 46241, South Korea.
This study explores quantum path information using the two-state vector formalism (TSVF) in a nested Mach-Zehnder interferometer. Experimental results align with TSVF, even with incomplete photon polarization.
Area of Science:
- Quantum mechanics
- Quantum optics
Background:
- The two-state vector formalism (TSVF) models quantum systems between pre- and post-selections.
- Mach-Zehnder interferometers are crucial for quantum path information studies.
Purpose of the Study:
- Investigate which-path information using TSVF in a polarization-based nested Mach-Zehnder interferometer (NMZI).
- Analyze photon polarization and path states within the NMZI.
Main Methods:
- Utilized a polarization-based nested Mach-Zehnder interferometer (NMZI).
- Manipulated photon polarization to probe which-path information.
- Examined interference conditions (constructive/destructive).
Main Results:
- Successfully investigated which-path information by adjusting photon polarization.
- Observed phenomena under both constructive and destructive interference conditions.
- Experimental findings were consistent with TSVF predictions.
Conclusions:
- The study validates the application of TSVF for analyzing quantum systems with pre- and post-selection.
- TSVF provides a robust framework for understanding quantum path information, even with incomplete polarization states.
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