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Unconventional Singularity in Anti-Parity-Time Symmetric Cavity Magnonics.

Y Yang1, Yi-Pu Wang1, J W Rao1

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This study demonstrates two singularities, exceptional points (EPs) and bound states in the continuum (BICs), within a single anti-parity-time (anti-PT) symmetric cavity magnonics system. These singularities enable robust photon-magnon superposition and slow light effects.

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Area of Science:

  • Quantum optics
  • Cavity magnonics
  • Non-Hermitian physics

Background:

  • Parity-time (PT) symmetry and its anti-symmetric counterpart (anti-PT) are crucial in non-Hermitian systems.
  • Cavity magnonics, the study of light-matter interactions with magnons, offers a platform for exploring novel quantum phenomena.
  • Singularities like exceptional points (EPs) and bound states in the continuum (BICs) represent unique features in complex systems.

Purpose of the Study:

  • To engineer an anti-PT symmetric cavity magnonics system with controllable eigenspaces.
  • To investigate the coexistence and characteristics of two distinct singularities within the same system.
  • To explore the potential of these singularities for advanced quantum applications.

Main Methods:

  • Engineering an anti-parity-time (anti-PT) symmetric cavity magnonics system.
  • Precisely controlling the system's eigenspace.
  • Tuning magnon damping to induce exceptional points (EPs).
  • Analyzing the dissipative coupling of antiresonances to form bound states in the continuum (BICs).

Main Results:

  • Observation of two distinct singularities: exceptional points (EPs) and unconventional bound states in the continuum (BICs).
  • Maximal coherent superposition of photon and magnon states is sustained between EPs due to preserved anti-PT symmetry.
  • Bound states in the continuum (BICs) exhibit infinite discontinuities in group delay.
  • Both singularities were found to coexist at the equator of the Bloch sphere.

Conclusions:

  • The engineered system exhibits a unique hybrid state with simultaneous maximal coherent superposition and slow light capabilities.
  • The coexistence of EPs and BICs in this system opens new avenues for quantum information processing and device applications.
  • Precise control over eigenspace is key to accessing and manipulating these novel quantum phenomena.