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

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Published on: December 3, 2013

Witnessing Quantum Coherence: from solid-state to biological systems.

Che-Ming Li¹, Neill Lambert, Yueh-Nan Chen

¹Department of Engineering Science, National Cheng Kung University, Tainan 701, Taiwan. cmli@mail.ncku.edu.tw

Scientific Reports

|November 28, 2012

Summary

Researchers developed novel quantum witnesses to efficiently detect quantum coherence and dynamics. These indicators offer a more robust and precise method for verifying quantumness in complex systems, reducing experimental challenges.

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Area of Science:

Quantum physics
Quantum information science

Background:

Quantum coherence is a key non-classical feature of quantum systems.
Detecting quantumness in complex systems is experimentally challenging, often requiring invasive measurements or full quantum tomography.
Existing methods like the Leggett-Garg inequality (LGI) face limitations in feasibility and efficiency.

Purpose of the Study:

To introduce efficient and robust "quantum witnesses" for verifying quantum coherence and dynamics.
To provide a method that avoids the experimental burden of non-invasive measurements or tomographic processes.
To enhance the detection resolution for quantum dynamics in the time domain.

Main Methods:

Development of two novel "quantum witnesses".
Application of quantum witnesses to physical systems, including quantum transport in nanostructures and biological organisms.
Comparative analysis of quantum witnesses against the Leggett-Garg inequality (LGI).

Main Results:

The proposed quantum witnesses efficiently verify quantum coherence and dynamics.
These witnesses are robust and demonstrate significantly finer resolution compared to the LGI.
The method bypasses the need for complex tomographic procedures or non-invasive measurements.

Conclusions:

Quantum witnesses offer a more practical and efficient approach to detecting quantum coherence and dynamics.
These indicators can significantly reduce experimental overhead in complex quantum systems.
The findings may accelerate the verification of quantum phenomena in diverse physical and biological applications.