Proposal for a transmon-based quantum router

TL;DR

This paper proposes a quantum router for microwave photons using superconducting transmon qubits, modeling its operation with quantum Langevin equations, and predicts high success probabilities based on current experimental parameters.

Contribution

It introduces a novel transmon-based quantum router design and provides a detailed theoretical analysis of its operation and performance.

Findings

Router achieves over 94% photon transmission success probability.

Model accurately predicts router behavior using quantum Langevin equations.

Design is compatible with existing superconducting qubit technology.

Abstract

We propose an implementation of a quantum router for microwave photons in a superconducting qubit architecture consisting of a transmon qubit, SQUIDs and a nonlinear capacitor. We model and analyze the dynamics of operation of the quantum switch using quantum Langevin equations in a scattering approach and compute the photon reflection and transmission probabilities. For parameters corresponding to up-to-date experimental devices we predict successful operation of the router with probabilities above 94%.