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Updated: Mar 21, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

Unbalanced Homodyne Correlation Measurements.

B Kühn¹, W Vogel¹

¹Arbeitsgruppe Quantenoptik, Institut für Physik, Universität Rostock, D-18051 Rostock, Germany.

Physical Review Letters

|May 7, 2016

Summary

This summary is machine-generated.

This study introduces a new method to measure quantum properties of light using homodyne correlation measurements. This technique avoids complex photon-number resolving detectors, simplifying quantum state characterization.

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Published on: September 5, 2019

Area of Science:

Quantum optics
Quantum information science

Background:

Characterizing quantum states of light is crucial for quantum technologies.
Photon-number resolving detectors are often required but are complex and expensive.

Purpose of the Study:

To develop a method for measuring normal-ordered moments of the photon-number operator without photon-number resolving detectors.
To enable efficient certification of quantum properties of light.

Main Methods:

Utilizes unbalanced homodyne correlation measurements.
Employs a displaced dephased laser as the local oscillator.
Measures normal-ordered moments of the displaced photon-number operator.

Main Results:

Provides a simple approximation of quasiprobabilities, representing the quantum state.
Successfully demonstrated for a weakly squeezed vacuum state.
Illustrated for a single-photon-added thermal state.

Conclusions:

The introduced method offers a practical approach to quantum state characterization.
Efficiently certifies quantum properties of light through accessible observables.
Simplifies the experimental requirements for quantum state analysis.