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Magnetic Tweezers for the Measurement of Twist and Torque

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The Hong-Ou-Mandel interferometer: a new procedure for alignment.

P J Thomas¹, J Y Cheung, C J Chunnilall

¹National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, United Kingdom.

The Review of Scientific Instruments

|April 2, 2009

Summary

A new, cost-effective method simplifies Hong-Ou-Mandel interferometer construction by precisely aligning optical paths. This technique achieves high-visibility two-photon interference, crucial for quantum optics experiments.

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Area of Science:

Quantum Optics
Interferometry

Background:

Constructing Hong-Ou-Mandel interferometers requires precise alignment and length balancing of optical paths.
Existing methods may involve custom optics or expensive equipment, limiting accessibility.

Purpose of the Study:

To present a novel, accessible method for aligning and balancing optical paths in a Hong-Ou-Mandel interferometer.
To demonstrate the effectiveness of this method in achieving high-visibility quantum interference.

Main Methods:

Developed a technique requiring no custom optics or expensive equipment.
Utilized a two-photon interferometer sourced by degenerate noncollinear parametric photon pairs.
Applied the method to align optical paths and balance lengths.

Main Results:

Achieved optical path length balancing within an average of 11.6 micrometers.
Observed two-photon interference with visibilities of approximately 0.9.
Demonstrated applicability to arbitrary noncollinear emission angles, including nondegenerate cases.

Conclusions:

The presented method offers a practical and cost-effective solution for building Hong-Ou-Mandel interferometers.
This technique facilitates high-quality two-photon interference, advancing quantum optical experiments.
The method's versatility supports various noncollinear downconversion scenarios.