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Non-Markovian exceptional points by interpolating quantum channels.

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View abstract on PubMed

Summary
This summary is machine-generated.

Researchers generated quantum-channel exceptional points (EPs) in open quantum systems. This new method allows for quantum phase transitions and has potential applications in quantum sensing and control.

Keywords:
Optics and photonicsPhysics

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Area of Science:

  • Quantum Physics
  • Non-Hermitian Systems
  • Quantum Information

Background:

  • Exceptional points (EPs) are critical phenomena in non-Hermitian systems where eigenvalues and eigenvectors coalesce.
  • Traditional studies of EPs in open quantum systems often rely on simplified models like non-Hermitian Hamiltonians or Liouvillians, which do not capture the full complexity of quantum dynamics.

Purpose of the Study:

  • To introduce a general strategy for creating quantum-channel exceptional points (EPs) in single-qubit systems.
  • To explore the phase transitions and EP emergence in quantum channels without requiring additional symmetries.

Main Methods:

  • Developed a theoretical framework for generating quantum-channel EPs.
  • Investigated the natural phase transitions of quantum channels between purely real and complex-conjugate eigenvalue spectra.
  • Experimentally simulated single-qubit quantum channels using nuclear magnetic resonance (NMR) quantum computing.

    • Main Results:

    • Demonstrated that quantum channels exhibit two distinct phases (purely real or complex-conjugate eigenvalues) that can transition between each other.
    • Experimentally observed second-order quantum-channel EPs with high fidelity (93%) using NMR.
    • Extended the method to three channels, revealing exceptional lines and a third-order EP.

    Conclusions:

    • The proposed strategy provides a general method for generating quantum-channel EPs, offering a more complete description of open quantum dynamics.
    • The findings open avenues for applications in enhanced quantum sensing, quantum control, and phenomena like Jordan-chain mediated asymmetric conversion.