### Abstract

Excitation of a bound state in the continuum (BIC) through scattering is problematic since it is by definition uncoupled. Here, we consider a type of dressed BIC and show that it can be excited in a nonlinear system through multiphoton scattering and delayed quantum feedback. The system is a semi-infinite waveguide with linear dispersion coupled to a qubit, in which a single-photon, dressed BIC is known to exist. We show that this BIC can be populated via multiphoton scattering in the non-Markovian regime, where the photon delay time (due to the qubit-mirror distance) is comparable with the qubit’s decay. A similar process excites the BIC existing in an infinite waveguide coupled to two distant qubits, thus yielding stationary entanglement between the qubits. This shows, in particular, that single-photon trapping via multiphoton scattering can occur without band edge effects or cavities, the essential resource being instead the delayed quantum feedback provided by a single mirror or the emitters themselves.

Lingua originale | English |
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pagine (da-a) | 073601- |

Numero di pagine | 7 |

Rivista | Physical Review Letters |

Volume | 122 |

Stato di pubblicazione | Published - 2019 |

### All Science Journal Classification (ASJC) codes

- Physics and Astronomy(all)

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## Cita questo

Ciccarello, F., Ciccarello, F., Fang, Y-L. L., Calajó, G., & Baranger, H. U. (2019). Exciting a Bound State in the Continuum through Multiphoton ScatteringPlus Delayed Quantum Feedback.

*Physical Review Letters*,*122*, 073601-.