Duda, M. orcid.org/0009-0008-3083-4686, Brunswick, L. orcid.org/0000-0001-8157-7255, Wilson, L.R. orcid.org/0009-0008-9224-8543 et al. (1 more author) (2024) Efficient, high-fidelity single-photon switch based on waveguide-coupled cavities. Physical Review A, 110 (4). 042615. ISSN 2469-9926
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 Er = 96.4% and a fidelity Fr = 97.7%, or transmit the wave packet with an efficiency Et = 99.7% and a fidelity Ft = 99.8%. Such efficient, high-fidelity single-photon routing is essential for scalable photonic quantum technologies.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024 The author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. https://creativecommons.org/licenses/by/4.0/ |
Keywords: | Quantum Physics; Atomic, Molecular and Optical Physics; Physical Sciences |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematical and Physical Sciences The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Funding Information: | Funder Grant number Engineering and Physical Sciences Research Council 2887452 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/M013472/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/V021303/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/V026496/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 31 Oct 2024 12:33 |
Last Modified: | 31 Oct 2024 12:33 |
Status: | Published |
Publisher: | American Physical Society (APS) |
Refereed: | Yes |
Identification Number: | 10.1103/physreva.110.042615 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:219050 |