Exciting a Bound State in the Continuum through Multiphoton ScatteringPlus Delayed Quantum Feedback

Francesco Ciccarello, Francesco Ciccarello, Yao-Lung L. Fang, Giuseppe Calajó, Harold U. Baranger

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


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.
Original languageEnglish
Number of pages7
JournalPhysical Review Letters
Publication statusPublished - 2019

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


Dive into the research topics of 'Exciting a Bound State in the Continuum through Multiphoton ScatteringPlus Delayed Quantum Feedback'. Together they form a unique fingerprint.

Cite this