Tunable Quantum Router in a Dual-Rail Quantum Network via Giant Atom

In this project, we propose a tunable quantum router based on a \(\nabla\)-type giant atom embedded in a dual-rail waveguide, implemented on a superconducting circuits platform. By employing the Bethe ansatz method, we calculated the scattering properties of incident photons interacting with the giant atom.

Our results reveal chiral and nonreciprocal scattering behaviors, which can be harnessed to implement advanced quantum devices. The novel scattering properties are illustrated below:

These findings enable the realization of quantum routers, quantum gates, and quantum circulators through parameter tuning. The following diagram demonstrates the giant atom functioning as a tunable quantum circulator:

Additionally, we investigated the non-Markovian effects arising from the giant atom configuration within the waveguide and analyzed their impact on scattering behavior:

Our theoretical work advances quantum network development by providing a feasible scheme for on-chip tunable quantum information processing devices through precise manipulation of system parameters.

You can find the paper here (preprint in December 2024).