2019/08/31 by Yongguan Ke, A. V. Poshakinskiy, Alexander V. Poshakinskiy +3 · 101 citations
Computer Science · Physics and Astronomy · #Atomic physics #Inelastic scattering #Photon #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum mechanics #Quantum optics and atomic interactions #Qubit #Scattering #physics.optics #quant-ph
paper · pdf · doi:10.1103/physrevlett.123.253601
published in Physical Review Letters 123(25), 253601 (American Physical Society)
arxiv created 2019/11/13 · openalex publication_date 2019/12/19 · arxiv updated 2019/12/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We develop a rigorous theoretical approach for analyzing inelastic scattering of photon pairs in arrays of two-level qubits embedded into a waveguide. Our analysis reveals a strong enhancement of the scattering when the energy of incoming photons resonates with the double-excited subradiant states. We identify the role of different double-excited states in the scattering, such as superradiant, subradiant, and twilight states, as a product of single-excitation bright and subradiant states. Importantly, the N-excitation subradiant states can be engineered only if the number of qubits exceeds 2N. Both the subradiant and twilight states can generate long-lived photon-photon correlations, paving the way to storage and processing of quantum information.