Efficient single-photon routing in a double-waveguide system with a mirror
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Efficient single-photon routing in a double-waveguide system with a mirror Jin-Song Huang1 · Ji-Tai Zhong1 · Yan-Ling Li1 · Zhong-Hui Xu1 · Qing-Sheng Xiao1 Received: 19 December 2019 / Accepted: 28 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract High-efficiency routing of photon signals between different quantum channels is of great importance for a quantum network. We investigate theoretically the quantum routing of single photons in a double-waveguide system with an infinite waveguide channel and a semi-infinite waveguide channel terminated by a perfect mirror. Numerical results show that high transfer-rate routing between two channels can be effectively performed in a wide frequency range, arising from the interferences among photons scattered by the boundary mirror and the qubits coupled to the waveguide system. This may suggest a potential scattering setup to effectively control the single-photon quantum routing. Keywords Quantum routing · Scattering theory · Optical waveguide
1 Introduction Efficient routing of quantum information among different nodes is very essential in a quantum optical network [1]. During the past years, quantum routing of photons in coupled waveguide-emitter systems has attracted much attention, since photons serve as the ideal information carriers to propagate along the guided-wave channels, and the light field-matter interaction is utilized to manipulate the photon transmission. Accordingly, a lot of demonstrations on quantum routing, based on atomic qubits [2,3], quantum dots [4,5], optomechanical systems [6,7], whispering-gallery-mode resonators [8,9] and cavity (circuit) quantum electrodynamics [10–12] have been carried out in these coupled waveguide systems.
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Jin-Song Huang [email protected] School of Information Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China 0123456789().: V,-vol
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However, in many above schemes the routing efficiency is limited for the increasing ports in a multichannel quantum network. A low routing probability of no more than 0.5 from the input channel into other channels may restrict the efficient channel assignment of the transmission signals, and thus, it is of considerable interest to devise a quantum router with high routing capability. To address the problem, many proposals such as employing the asymmetric chiral photon-emitter coupling technique [13–18] or enhancing the spatial interference from other additional emitters [19–26] have been put forward recently in these routers. By using these approaches, desired high routing even approximating unity between different channels can be implemented efficiently, but the frequency bandwidth with high transfer-rate routing is limited only in a narrow range near the resonance frequency, which may restrict its practical uses. Controlling photon transport in a one-dimensional waveguide is currently motivating increasing interest because of its potential applications in quantum information a
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