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Frozen quantum coherence.

Thomas R Bromley1, Marco Cianciaruso1,2, Gerardo Adesso1

  • 1School of Mathematical Sciences, The University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.

Physical Review Letters
|June 13, 2015
PubMed
Summary
This summary is machine-generated.

Quantum coherence in multi-qubit systems can be preserved against noise under specific conditions. For even N-qubit systems, universal criteria involving initial states and local channels ensure coherence invariance, offering insights into quantum correlations.

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Area of Science:

  • Quantum Information Science
  • Quantum Many-Body Systems
  • Quantum Thermodynamics

Background:

  • Quantum coherence is a fundamental resource in quantum information processing.
  • Noise and decoherence typically degrade quantum states over time.
  • Understanding conditions for coherence preservation is crucial for robust quantum technologies.

Purpose of the Study:

  • To identify dynamical conditions under which quantum coherence remains unaffected by noise in open quantum systems.
  • To investigate the behavior of coherence measures for single and multi-qubit systems.
  • To provide a physical interpretation for the freezing phenomenon of quantum correlations.

Main Methods:

  • Analysis of coherence measures for single and N-qubit systems under local incoherent channels.
  • Identification of specific initial states and channel conditions for coherence invariance.
  • Derivation of analytical results for distance-based coherence measures in two-qubit states.

Main Results:

  • For single qubits, different coherence measures freeze under distinct conditions.
  • For even N-qubit systems, universal conditions are found to render all distance-based coherence monotones invariant.
  • A physical interpretation for the freezing of quantum correlations beyond entanglement is established.

Conclusions:

  • Preserving quantum coherence against noise is achievable in multi-qubit systems under specific universal conditions.
  • The study offers a deeper understanding of decoherence and coherence freezing phenomena.
  • The findings have implications for the development of noise-resilient quantum information processing.