Related papers: Efficient, High-Fidelity Single-Photon Switch Based on Waveguide-Coupled Cavities

Efficient, High-Fidelity Single-Photon Switch Based on Waveguide-Coupled Cavities

URL: http://arxiv.org/abs/2402.05714v3
Date: Thu, 17 Oct 2024 08:03:09 GMT
Title: Efficient, High-Fidelity Single-Photon Switch Based on Waveguide-Coupled Cavities
Authors: Mateusz Duda, Luke Brunswick, Luke R. Wilson, Pieter Kok,
Abstract summary: We show that waveguide-coupled cavities with embedded two-level emitters can act as a highly efficient single-photon switch. We find that a single waveguide-coupled cavity can route input photon wave packets with near-unity efficiency and fidelity. Such efficient, high-fidelity single-photon routing is essential for scalable photonic quantum technologies.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: We demonstrate theoretically that waveguide-coupled cavities with embedded two-level emitters can act as a highly efficient, high-fidelity single-photon switch. The photon switch is an optical router triggered by a classical signal -- the propagation direction of single input photons in the waveguide is controlled by changing the emitter-cavity coupling parameters in situ, for example using applied fields. The switch reflects photons in the weak emitter-cavity coupling regime and transmits photons in the strong coupling regime. By calculating transmission and reflection spectra using the input-output formalism of quantum optics and the transfer matrix approach, we obtain the fidelity and efficiency of the switch with a single-photon input in both regimes. We find that a single waveguide-coupled cavity can route input photon wave packets with near-unity efficiency and fidelity if the wave packet width is smaller than the cavity mode linewidth. We also find that using multiple waveguide-coupled cavities increases the switching bandwidth, allowing wider wave packets to be routed with high efficiency and fidelity. For example, an array of three waveguide-coupled cavities can reflect an input Gaussian wave packet with a full width at half-maximum of 1 nm (corresponding to a few-picosecond pulse) with an efficiency E_r = 96.4% and a fidelity F_r = 97.7%, or transmit the wave packet with an efficiency E_t = 99.7% and a fidelity F_t = 99.8%. Such efficient, high-fidelity single-photon routing is essential for scalable photonic quantum technologies.

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