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Related Experiment Video

Updated: Jun 22, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

Heisenberg limited Sagnac interferometry.

Aziz Kolkiran, G S Agarwal

|June 24, 2009

Summary

Entangled photons from parametric down-conversion enhance Sagnac interferometer sensitivity. Using two-photon and four-photon coincidences improves sensitivity by factors of two and four, respectively.

Area of Science:

Quantum Optics
Interferometry
Photonics

Background:

Sagnac interferometers are crucial for rotation sensing.
Improving interferometer sensitivity is a key challenge in metrology.

Purpose of the Study:

To investigate the use of entangled photons to enhance Sagnac interferometer sensitivity.
To quantify the sensitivity improvement using multi-photon coincidences.

Main Methods:

Utilizing entangled photons generated via spontaneous parametric down-conversion (SPDC).
Analyzing two-photon and four-photon coincidence measurements.
Applying the method to a Sagnac interferometer setup.

Main Results:

Achieved a two-fold sensitivity increase with two-photon coincidences.

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Published on: March 22, 2019

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Last Updated: Jun 22, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

Implementation of a Reference Interferometer for Nanodetection

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

Achieved a four-fold sensitivity increase with four-photon coincidences.

Demonstrated applicability for arbitrary pumping and squeezing parameters.

Conclusions:

Entangled photon-enhanced interferometry offers significant sensitivity gains.
The proposed method provides a scalable approach for improving rotation sensing.
This technique is robust across various source parameters.