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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Wave dislocation line threaded polarization interferometer.

Anagha Sreedharan, Nirmal K Viswanathan

|February 15, 2022

Summary

Researchers visualized wave dislocation lines in a polarization interferometer by simulating and demonstrating the phenomenon in the vector domain. This study reveals spiral and saddle topological structures in complex Stokes phase.

Area of Science:

Optics and Photonics
Wave Phenomena
Topological Physics

Background:

Wave dislocations are fundamental phenomena with applications in various fields.
Berry proposed visualizing wave dislocations in the scalar domain.
Experimental demonstration in the vector domain is crucial for applied research.

Purpose of the Study:

To simulate and experimentally demonstrate wave dislocation lines in the vector domain.
To visualize the threading of parameter space by wave dislocation lines.
To investigate topological structures in complex Stokes phase.

Main Methods:

Construction of a closed-circuit polarization interferometer.
Utilizing a rotated-tilted quartz crystal plate to introduce phase differences.

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Continuous variation of phase difference between ordinary and extraordinary beams.

Simulation and experimental demonstration in the vector domain.

Main Results:

Successful visualization of wave dislocation lines.
Observation of spiral- and saddle-type topological structures.
Appearance of ±1 dislocation number structures in the complex Stokes phase.
Correlation of topological structures with ± π/2 phase differences and zero-crossings of Stokes parameters.

Conclusions:

The study experimentally validates the concept of wave dislocations in the vector domain.
The findings contribute to understanding topological structures in optical polarization.
This work has potential implications for advanced optical technologies and fundamental physics.