6533b7d3fe1ef96bd126095f
RESEARCH PRODUCT
Exciting a Bound State in the Continuum through Multi-Photon Scattering plus Delayed Quantum Feedback
Yao-lung L. FangFrancesco CiccarelloHarold U. BarangerGiuseppe Calajósubject
Quantum opticsPhysics---Quantum PhysicsPhotonQuantum optics waveguide QED quantum non-Markovian dynamicsScatteringGeneral Physics and AstronomyPhysics::OpticsFOS: Physical sciencesQuantum entanglementQuantum Physics01 natural sciencesSettore FIS/03 - Fisica Della MateriaQuantum mechanicsQubitExcited state0103 physical sciencesBound state010306 general physicsQuantum Physics (quant-ph)ExcitationPhysics - OpticsOptics (physics.optics)description
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 multi-photon 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 multi-photon 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 multi-photon scattering can occur without band-edge effects or cavities, the essential resource being instead the {\it delayed} quantum feedback provided by a single mirror or the emitters themselves.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-02-22 |