Exciting a Bound State in the Continuum through Multiphoton Scattering Plus Delayed Quantum Feedback.

Journal Article (Journal Article)

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.

Full Text

Duke Authors

Cited Authors

  • Calajó, G; Fang, Y-LL; Baranger, HU; Ciccarello, F

Published Date

  • February 22, 2019

Published In

Volume / Issue

  • 122 / 7

Start / End Page

  • 073601 -

PubMed ID

  • 30848634

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

Digital Object Identifier (DOI)

  • 10.1103/PhysRevLett.122.073601


  • eng

Conference Location

  • United States