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.

Giuseppe Calajó, Y.L.F. (2019). Exciting a Bound State in the Continuum through Multiphoton Scattering Plus Delayed Quantum Feedback. PHYSICAL REVIEW LETTERS, 122(7) [10.1103/PhysRevLett.122.073601].

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

Francesco Ciccarello
2019-02-22

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.
22-feb-2019
Settore FIS/03 - Fisica Della Materia
Giuseppe Calajó, Y.L.F. (2019). Exciting a Bound State in the Continuum through Multiphoton Scattering Plus Delayed Quantum Feedback. PHYSICAL REVIEW LETTERS, 122(7) [10.1103/PhysRevLett.122.073601].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/349795
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