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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Generating squeezed vacuum field with nonzero orbital angular momentum with atomic ensembles.

Mi Zhang, Joseph Soultanis, Irina Novikova

|December 11, 2013

Summary

Researchers generated squeezed vacuum optical fields with orbital angular momentum (OAM) using a specific laser process. Similar quantum noise reduction was achieved with different pump beams, despite varying optimal conditions.

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Area of Science:

Quantum optics
Laser physics
Nonlinear optics

Background:

Squeezed vacuum states are crucial for reducing quantum noise in optical measurements.
Orbital angular momentum (OAM) offers unique properties for light manipulation.
Polarization self-rotation is a nonlinear optical phenomenon used for generating squeezed light.

Purpose of the Study:

To investigate the generation of squeezed vacuum optical fields with orbital angular momentum (OAM).
To compare the effectiveness of different pump beam types (Laguerre-Gaussian vs. Gaussian) in OAM squeezed light generation.
To analyze the influence of self-defocusing on the degree of vacuum squeezing.

Main Methods:

Utilized a polarization self-rotation squeezing process with a pump field carrying nonzero orbital angular momentum (OAM).
Employed first-order Laguerre-Gaussian and regular Gaussian pump beams.
Monitored quantum noise levels and output beam transverse profiles at varying laser powers and atomic densities.

Main Results:

Successfully generated a squeezed vacuum optical field with OAM matching the pump field's OAM.
Achieved comparable maximum quantum noise reduction using both Laguerre-Gaussian and Gaussian pump beams.
Observed no direct correlation between increased beam size due to self-defocusing and the degree of vacuum squeezing.

Conclusions:

Orbital angular momentum can be imprinted onto squeezed vacuum states via the polarization self-rotation process.
The choice of pump beam profile affects optimal operating conditions but not the maximum achievable squeezing level.
Self-defocusing does not inherently limit the degree of vacuum squeezing in this setup.