Single-photon routing with whispering-gallery resonators

Abstract

Quantum routing of single photons in a system with two waveguides coupled to two whispering-gallery resonators (WGRs) are investigated theoretically. With a real-space full quantum theory, photonic scattering amplitudes along four ports of the waveguide network are analytically obtained. It is shown that, by adjusting the geometric and physical parameters of the two-WGR configuration, the quantum routing properties of single photons along the present waveguide network can be controlled effectively. For example, the routing capability from input waveguide to another one can significantly exceed 0.5 near the resonance point of scattering spectra, which can be achieved with only one resonator. By properly designing the distance between two WGRs and the waveguide-WGR coupling strengths, the transfer rate between the waveguides can also reach certain sufficiently high values even in the non-resonance regime. Moreover, Fano-like resonances in the scattering spectra are designable. The proposed system may provide a potential application in controlling single-photon quantum routing as a novel router.

Phase-tunable quantum router

“…Recently, with the development of quantum information technologies, many quantum devices at the single-photon level have been proposed based on the interaction of confined propagating fields with single atom. Especially related research on quantum routers [32][33][34][35][36][37][38][39][40][41][42][43] is most prominent. We all know that classic routers have multiple output ports for distributing and storing information.…”

Dynamic modulated single-photon routing

“…[2][3][4][5][6] As one kind of typical node devices, quantum routers are essential elements in quantum networks, which can be exploited to transfer information from its source to different quantum channels. In this regard, a variety of theoretical and experimental efforts have been devoted to the realization and development of single-photon router based on atomic systems, [7][8][9] whispering-gallery resonators, [10][11][12][13] optomechanical systems, [14][15][16][17] cavity (circuit) quantum electrodynamics (QED), [18][19][20][21][22] and waveguide-QED systems. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] However, most of the previous single-photon router can only work well with a high routing efficiency at the resonant or selected frequency point under the condition that all the system dissipations are completely ignored.…”

Realization of Tunable Highly-Efficient Quantum Routing in Chiral Waveguides

“…Quantum nodes, which generate, process and store quantum information, are connected by long-distance quantum channels, while quantum repeaters establish and distribute entanglement. As one kind of node devices, quantum routers [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] are a key component of quantum network, which can transmit information continuously between remote quantum nodes. Photons play significant roles in the construction of quantum router because they are relatively free of the decoherence [23,24]that plagues other quantum systems, and can be manipulated and detected easily.…”