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Non-Hermitian Magnon-Photon Interference in an Atomic Ensemble.

Rong Wen1, Chang-Ling Zou2, Xinyu Zhu1

  • 1State Key Laboratory of Precision Spectroscopy, Quantum Institute for Light and Atoms, School of Physics and Materials Science, East China Normal University, Shanghai 200241, China.

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|July 27, 2019
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Researchers demonstrate a tunable non-Hermitian beam splitter (BS) for controlling photon and magnon interference. This breakthrough allows for reconfigurable quantum interactions, opening new avenues in quantum information and non-Hermitian physics.

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Area of Science:

  • Quantum Optics and Photonics
  • Condensed Matter Physics
  • Quantum Information Science

Background:

  • Interference of photons in beam splitters typically exhibits bosonic coalescence.
  • Non-Hermitian systems with open quantum dynamics are crucial for quantum information processing and metrology.
  • Control over the Hermiticity of photonic devices is challenging, often material-dependent.

Purpose of the Study:

  • To demonstrate a tunable non-Hermitian beam splitter (BS) for controlling photon-magnon interference.
  • To explore the crossover between Hermitian and non-Hermitian regimes in a magnon-photon BS.
  • To investigate the potential for single-quantum level operation and study non-Hermitian quantum physics.

Main Methods:

  • Utilized an interface between traveling photonic and localized magnonic modes.
  • Controlled coherent and incoherent interactions via atomic excited levels, tuned by a control laser.
  • Achieved a tunable non-Hermitian beam splitter by reconfiguring interactions through laser detuning.

Main Results:

  • Demonstrated a tunable non-Hermitian beam splitter for magnon-photon interference.
  • Observed a correlated interference pattern between photons and magnons.
  • Showcased the crossover from Hermitian to non-Hermitian behavior by controlling quantum interactions.

Conclusions:

  • The developed system provides a versatile quantum interface for photons and magnons.
  • Enables the study of non-Hermitian quantum physics and parity-time symmetry.
  • Offers potential for single-quantum level operation in hybrid quantum systems.