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Updated: Oct 1, 2025

Gradient Echo Quantum Memory in Warm Atomic Vapor

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Published on: November 11, 2013

Distinguishing between Quantum and Classical Markovian Dephasing Dissipation.

Alireza Seif¹, Yu-Xin Wang¹, Aashish A Clerk¹

¹Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, USA.

Physical Review Letters

|March 4, 2022

Summary

Dissipation in quantum systems can be truly quantum if it generates entanglement. Broken time-reversal symmetry is essential for this quantum dissipation, requiring more than just non-zero bath susceptibilities.

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Area of Science:

Quantum Information Science
Quantum Many-Body Systems
Open Quantum Systems

Background:

Investigating the quantum nature of dissipation in open quantum systems is crucial for both fundamental understanding and practical applications.
Dissipation, often viewed classically, can exhibit genuinely quantum properties.

Purpose of the Study:

To determine conditions under which bath-induced dissipation in a quantum system can generate entanglement.
To identify criteria for classifying dissipation as 'truly quantum'.

Main Methods:

Analysis of n qubits under correlated Markovian dephasing.
Investigation of the role of time-reversal symmetry in dissipative processes.
Development of an experimental protocol for identifying quantum dephasing.

Main Results:

A sufficient condition for dissipation to generate system entanglement (truly quantum dissipation) was established.
Broken time-reversal symmetry was identified as a necessary condition for dissipative entanglement generation.
Nonzero bath susceptibilities alone do not guarantee quantum dissipation.

Conclusions:

Dissipation can be fundamentally quantum, capable of generating entanglement in open quantum systems.
The presence or absence of time-reversal symmetry is a critical factor in quantum dissipation.
The study provides a framework for experimental verification and the development of noise mitigation strategies.