Deterministic Switching of a Superconducting Qubit by a Single Microwave Photon(Research)

Abstract

In one-dimensional optical setups, light-matter interaction is drastically enhanced by the interference between the incident and scattered fields. Particularly, in an "impedance-matched" Λ system, a single photon deterministically induces the Raman transition and switches the quantum state of the Λ system. Here we report implementation of such a Λ system by the dressed-state engineering in circuit QED and observation of perfect extinction of reflection and highly efficient down-conversion. These results lead to deterministic quantum gates between material qubits and microwave photons.