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.
|Numero di pagine||7|
|Rivista||Physical Review Letters|
|Stato di pubblicazione||Published - 2019|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
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-.