Efficient Single-Photon Routing: Exploiting Giant Atoms in Waveguide QED Ladders

Abstract: In this poster, we investigate single-photon routing in a giant atom/waveguide quantum electrodynamics (QED) system comprising two to five giant atoms positioned between two waveguides [1]. Giant atoms are realized as superconducting circuits, which serve as a leading platform for quantum computing. Photon routing is essential for quantum computers and circuits to facilitate information transfer between nodes. A real-space approach is employed to determine the transmission and reflection probabilities at each port of the photon router, aiming to achieve deterministic routing [2]. The analysis assumes an open quantum system and applies the rotating-wave approximation, omitting the dipole approximation because it is inapplicable to giant atoms. Future work will establish stronger connections with current or near-term experiments to enable experimentally feasible predictions.

References:

[1] A.F. Kockum, “Quantum optics with giant atom–the first five years,” in International Symposium on Mathematics, Quantum Theory, and Cryptography, vol. 33, pp. 125-146, Springer Singapore, 2021.

[2] J.T. Shen and S. Fan, “Coherent single photon transport in a one-dimensional waveguide coupled with superconducting quantum bits,” in Physical Review Letters, vol. 95, pp. 213001, American Physical Society, 2005.