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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Locality and universality of quantum memory effects.

B-H Liu1, S Wißmann2, X-M Hu3

  • 11] Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, 230026, China [2].

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This study introduces a new way to measure non-Markovianity in quantum systems by analyzing information exchange. This simplifies quantifying memory effects in complex quantum dynamics.

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Area of Science:

  • Quantum Physics
  • Complex Systems Dynamics
  • Information Theory

Background:

  • Modeling complex systems often requires non-Markovian stochastic processes.
  • Defining non-Markovianity in quantum systems is complex, with ongoing debate.
  • Existing methods for quantifying memory effects in open quantum systems are varied.

Purpose of the Study:

  • To derive a mathematical representation for non-Markovianity based on system-environment information exchange.
  • To reveal the locality and universality of non-Markovianity within quantum state space.
  • To simplify the numerical and experimental determination of memory effects.

Main Methods:

  • Derivation of a novel mathematical representation for non-Markovianity.
  • Analysis of information exchange between open quantum systems and their environment.
  • Implementation of an all-optical experiment for measurement.

Main Results:

  • A simplified and universally applicable measure for non-Markovianity.
  • Demonstration of locality of non-Markovianity in the quantum state space.
  • High-accuracy measurement of memory effects in a photonic quantum process.

Conclusions:

  • The derived representation simplifies the characterization and quantification of memory effects.
  • The new method facilitates both numerical simulations and experimental determination.
  • This work provides a robust framework for understanding non-Markovian dynamics in quantum information processing.