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Related Experiment Video

Updated: Jan 21, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Coherence and Asymmetry Cannot be Broadcast.

Matteo Lostaglio¹, Markus P Müller^2,3

¹ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels (Barcelona) 08860, Spain.

Physical Review Letters

|August 7, 2019

Summary

This summary is machine-generated.

Quantum coherence, a valuable resource for quantum technologies, cannot be broadcast indefinitely. This study proves that distributing quantum asymmetry is fundamentally limited by quantum mechanics, even for weaker forms like catalytic coherence.

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Published on: December 3, 2013

Area of Science:

Quantum Information Science
Quantum Thermodynamics
Quantum Metrology

Background:

Conservation laws prevent quantum dynamics from generating superpositions of eigenstates.
Quantum coherence acts as a resource for asymmetry, useful in quantum metrology and thermodynamics.
The possibility of broadcasting quantum coherence to distribute asymmetry was an open question.

Purpose of the Study:

To investigate whether quantum coherence (asymmetry) can be broadcast from a reference system to other systems.
To determine the fundamental limits on distributing quantum asymmetry.
To address open questions regarding quantum clock information sharing and quantum thermodynamics catalysis.

Main Methods:

Theoretical analysis using quantum mechanics principles.
Development of a no-go theorem for broadcasting coherence in finite-dimensional systems.
Investigation of conditions for weaker forms of coherence broadcasting.

Main Results:

A no-go theorem demonstrates that broadcasting quantum coherence is forbidden in finite-dimensional systems.
The study answers open questions about sharing timing information and catalysis in quantum thermodynamics.
Weaker forms of broadcasting, including catalytic coherence, are only possible with infinite-dimensional reference systems.

Conclusions:

Quantum mechanics fundamentally limits the indefinite distribution of quantum coherence and asymmetry.
This research establishes fundamental limits on manipulating quantum coherence.
The findings clarify the role and limitations of quantum reference frames in catalytic processes.