Landau-Zener-St\"{u}ckelberg Interference of Microwave Dressed States of a Superconducting Phase Qubit

TL;DR

This paper reports the first observation of Landau-Zener-Stückelberg interference in microwave-dressed states of a superconducting phase qubit, demonstrating control over quantum states for potential quantum computing applications.

Contribution

It experimentally demonstrates LZS interference in a superconducting qubit and shows how this can be used for quantum state control and logic gate implementation.

Findings

Quantitative agreement with theoretical predictions

Controlled quantum state manipulation via LZS interferometry

Potential for implementing multipartite quantum logic gates

Abstract

We present the first observation of Landau-Zener-St\"{u}ckelberg (LZS) interference of the dressed states arising from an artificial atom, a superconducting phase qubit, interacting with a microwave field. The dependence of LZS interference fringes on various external parameters and the initial state of the qubit agrees quantitatively very well with the theoretical prediction. Such LZS interferometry between the dressed states enables us to control the quantum states of a tetrapartite solid-state system with ease, demonstrating the feasibility of implementing efficient multipartite quantum logic gates with this unique approach.