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Related Concept Videos

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing...
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Related Experiment Video

Updated: May 4, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor
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Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 12, 2013

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Optimally Fast Qubit Reset.

Yue Liu1, Chenlong Huang1, Xingyu Zhang1

  • 1Xiamen University, Department of Physics and Jiujiang Research Institute, Xiamen 361005, Fujian, China.

Physical Review Letters
|March 28, 2025
PubMed
Summary

Fast qubit reset requires significant thermodynamic cost. This study develops a framework for minimal cost and optimal protocols for memory erasure, revealing key trade-offs and suggesting super-Ohmic bosonic baths for efficient qubit reset.

Area of Science:

  • Quantum Information Science
  • Thermodynamics
  • Quantum Computing

Background:

  • Qubit reset is crucial for quantum computation but is thermodynamically costly.
  • Current methods exceed theoretical limits like the Landauer bound.

Purpose of the Study:

  • To establish a general framework for minimal thermodynamic cost in memory erasure.
  • To identify optimal protocols for arbitrary erasure speeds.
  • To analyze the impact of erasure speed on thermodynamic cost.

Main Methods:

  • Developed a theoretical framework for memory erasure.
  • Analyzed entropy production based on jump operator convergence/divergence.
  • Investigated trade-offs between reset time and error probability.
  • Utilized fermionic and bosonic baths as illustrative models.

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Related Experiment Videos

Last Updated: May 4, 2026

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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Main Results:

  • Minimal entropy production shows divergent behavior in the short-time limit.
  • Identified an inherent trade-off between reset time and error probability for convergent systems.
  • Optimal protocols exhibit general features in the fast-driving regime.

Conclusions:

  • The study provides a general approach to optimize qubit reset protocols.
  • Super-Ohmic bosonic heat baths are identified as suitable for efficient qubit reset.
  • Understanding thermodynamic costs is key to advancing quantum computing.