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Related Concept Videos

The Uncertainty Principle04:08

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Updated: May 31, 2026

Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Universal Precision Limits in General Open Quantum Systems.

Tan Van Vu1, Ryotaro Honma1, Keiji Saito2

  • 1Kyoto University, Yukawa Institute for Theoretical Physics, Center for Gravitational Physics and Quantum Information, Kitashirakawa Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.

Physical Review Letters
|May 29, 2026
PubMed
Summary
This summary is machine-generated.

We established new bounds on the precision of measurements in open quantum systems, extending beyond simple models. These thermodynamic uncertainty relations reveal fundamental limits influenced by environmental interactions and measurement asymmetry.

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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Last Updated: May 31, 2026

Setting Limits on Supersymmetry Using Simplified Models
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Area of Science:

  • Quantum Thermodynamics
  • Statistical Mechanics
  • Open Quantum Systems

Background:

  • Thermodynamic and kinetic uncertainty relations link measurement precision to thermodynamic costs.
  • Previous studies primarily focused on Markovian systems, leaving non-Markovian constraints largely unexplored.
  • Understanding precision limits in complex quantum environments is crucial for quantum technologies.

Purpose of the Study:

  • To derive universal bounds on the precision of observables in non-Markovian open quantum systems.
  • To explore precision constraints beyond the Markovian approximation, considering arbitrary coupling strengths.
  • To introduce and analyze the role of process asymmetry in limiting measurement precision.

Main Methods:

  • Derivation of universal precision bounds for generic observables in open quantum systems.
  • Introduction of an asymmetry term to quantify forward-backward process disparity.
  • Analysis of time-antisymmetric currents and generalized activity for fluctuation bounds.

Main Results:

  • Relative fluctuation of time-antisymmetric currents is constrained by entropy production and process asymmetry.
  • Relative fluctuation of general observables is bounded below by a generalized activity term.
  • Established universal bounds applicable to systems with arbitrary coupling strengths and non-Markovian dynamics.

Conclusions:

  • The study provides a comprehensive framework for precision limits in a broad class of open quantum systems.
  • Demonstrated that thermodynamic costs and process asymmetry fundamentally limit measurement precision.
  • Results extend the understanding of uncertainty relations beyond the traditional Markovian setting.