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

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Robust laser beam engineering using polarization and angular momentum diversity.

Priyanka Lochab, P Senthilkumaran, Kedar Khare

|August 10, 2017

Summary

This summary is machine-generated.

Engineered laser beams carrying orbital angular momentum (OAM) in orthogonal polarizations show complementary intensity patterns. This polarization and OAM diversity enhances robustness against phase fluctuations for improved signal quality.

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Area of Science:

Optics and Photonics
Laser Physics
Quantum Information

Background:

Orbital angular momentum (OAM) offers unique properties for laser beam applications.
Maintaining beam quality through turbulent environments is a significant challenge.
Orthogonal polarizations can be used to encode independent information.

Purpose of the Study:

To engineer a laser beam capable of carrying both l=0 and l=1 OAM states in orthogonal polarizations.
To investigate the beam's robustness against random phase fluctuations.
To demonstrate improved signal-to-noise ratio (SNR) in the far-field intensity pattern.

Main Methods:

Engineering a laser beam with dual OAM states (l=0, l=1) in orthogonal polarizations.
Collinear transmission of the engineered beam through a random phase screen.
Analysis of far-field diffraction intensity patterns and their correlation.
Experimental and simulation-based SNR measurements.

Main Results:

Individual polarization states exhibited complementary far-field diffraction patterns with negative correlation.
The combined intensity profile remained robust against time-varying phase fluctuations.
Significant SNR improvement was observed for the central lobe of the combined pattern compared to individual polarizations.

Conclusions:

Polarization and OAM diversity provide a method for robust laser beam engineering.
This approach offers enhanced resilience to phase distortions without active correction.
The demonstrated concept is valuable for applications requiring stable laser beam propagation.