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Area of Science:

  • Quantum Optics
  • Condensed Matter Physics
  • Nonlinear Optics

Background:

  • Bound states in the continuum (BICs) are theoretically uncoupled states, making their excitation challenging.
  • Previous methods for BIC excitation often rely on specific system geometries or band edge effects.
  • Understanding novel excitation mechanisms for BICs is crucial for quantum information processing and optical devices.

Purpose of the Study:

  • To demonstrate the excitation of a dressed bound state in the continuum (BIC) in a nonlinear system.
  • To explore the role of multiphoton scattering and delayed quantum feedback in BIC population.
  • To investigate the potential for single-photon trapping and entanglement generation using this mechanism.

Main Methods:

  • Theoretical modeling of a semi-infinite waveguide coupled to a qubit, supporting a single-photon dressed BIC.
  • Analysis of multiphoton scattering in the non-Markovian regime, considering photon delay times.
  • Extension of the model to an infinite waveguide coupled to two distant qubits to study entanglement.

Main Results:

  • Successful excitation of a dressed BIC via multiphoton scattering and delayed quantum feedback in the nonlinear waveguide-qubit system.
  • Demonstration that BIC population occurs in the non-Markovian regime where photon delay is comparable to qubit decay.
  • Observation of stationary entanglement between two distant qubits excited by a similar BIC-generating process.

Conclusions:

  • Delayed quantum feedback, rather than band edge effects or cavities, is the essential resource for exciting dressed BICs.
  • Multiphoton scattering provides a viable pathway for single-photon trapping in dressed BICs.
  • The proposed mechanism offers a new route for generating entanglement in quantum systems.