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Related Experiment Video

Updated: Jun 20, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Quantum coherence and anomalous work extraction in qubit gate dynamics.

F Perciavalle¹, N Lo Gullo¹, F Plastina¹

¹Gruppo Collegato di Cosenza, INFN, Università della Calabria, Dipartimento di Fisica, 87036 Arcavacata di Rende (CS), Italy and , 87036 Arcavacata di Rende, Cosenza, Calabria, Italy.

Physical Review. E

|June 19, 2026

Summary

This summary is machine-generated.

This study uses the Kirkwood-Dirac quasiprobability distribution to quantify coherence in quantum work extraction. It reveals conditions for anomalous work extraction in quantum circuits, even with energy gain.

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Last Updated: Jun 20, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Area of Science:

Quantum Thermodynamics
Quantum Information Theory
Quantum Computation

Background:

Coherence plays a crucial role in quantum thermodynamics.
Understanding work extraction in quantum systems is essential for quantum technologies.
Cyclic quantum evolutions and quasiprobability distributions offer a framework for analysis.

Purpose of the Study:

To quantify the contribution of coherence to work extraction in generic, cyclic quantum evolutions.
To investigate
anomalous processes
where work can be extracted despite energy gain, using the Kirkwood-Dirac quasiprobability distribution.
To analyze the thermodynamic properties of quantum circuits and their constituent gates.

Main Methods:

Utilizing the Kirkwood-Dirac quasiprobability distribution framework.
Applying the framework to qubits undergoing sequences of single- and two-qubit gate operations.
Analyzing the quasiprobabilistic structure of deep quantum circuits.

Main Results:

Quantified the contribution of coherence to work extraction.
Identified specific conditions for anomalous work exchanges in quantum systems.
Established a compositional relation for work statistics in deep quantum circuits based on constituent gates.
Demonstrated the role of coherence in the thermodynamics of basic quantum computational elements.

Conclusions:

Coherence is a key resource for work extraction in quantum systems.
The Kirkwood-Dirac quasiprobability distribution provides valuable insights into quantum thermodynamics.
This framework lays the groundwork for studying the thermodynamic relevance of specific quantum circuits.