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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Quantum heat baths satisfying the eigenstate thermalization hypothesis.

O Fialko1

  • 1Institute of Natural and Mathematical Sciences and Centre for Theoretical Chemistry and Physics, Massey University, Auckland, New Zealand.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 19, 2015
PubMed
Summary
This summary is machine-generated.

We propose quantum heat baths that cause smaller systems to reach thermal equilibrium. Residual fluctuations in these baths drive the thermalization and decoherence of coupled quantum systems, like qubits.

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Area of Science:

  • Quantum thermodynamics
  • Statistical mechanics
  • Quantum information theory

Background:

  • The eigenstate thermalization hypothesis (ETH) provides a theoretical framework for understanding thermalization in isolated quantum systems.
  • Autonomous quantum heat baths are crucial for studying thermalization dynamics in open quantum systems.
  • Understanding the mechanisms of thermalization is fundamental to quantum thermodynamics.

Purpose of the Study:

  • To propose a class of autonomous quantum heat baths satisfying ETH criteria.
  • To investigate how these baths induce thermal relaxation in smaller coupled quantum systems.
  • To analyze the role of bath fluctuations in the thermalization and decoherence process.

Main Methods:

  • Theoretical proposal of autonomous quantum heat baths adhering to ETH.
  • Analysis of local observables and their residual fluctuations within the bath.
  • Investigation of the interaction between the bath and a smaller quantum system (e.g., a qubit).
  • Numerical simulations to model the thermalization dynamics.

Main Results:

  • Demonstrated that proposed ETH quantum heat baths drive thermal relaxation in coupled systems.
  • Identified residual fluctuations of bath observables as the mechanism perturbing the small system.
  • Showed that these perturbations lead to decoherence and convergence to a thermal state.
  • Confirmed theoretical predictions through numerical simulations for a qubit-bath system.

Conclusions:

  • Autonomous quantum heat baths satisfying ETH can effectively thermalize smaller quantum systems.
  • Residual bath fluctuations are key drivers of thermalization and decoherence in open quantum systems.
  • The proposed framework offers a new avenue for studying thermalization in quantum thermodynamics and information science.