Demonstration of Geometric Landau-Zener Interferometry in a Superconducting Qubit

Xinsheng Tan, Dan-Wei Zhang, Zhentao Zhang, Yang Yu, Siyuan Han, and Shi-Liang Zhu

Phys. Rev. Lett. 112, 027001 – Published 14 January 2014

Abstract

Geometric quantum manipulation and Landau-Zener interferometry have been separately explored in many quantum systems. In this Letter, we combine these two approaches to study the dynamics of a superconducting phase qubit. We experimentally demonstrate Landau-Zener interferometry based on the pure geometric phases in this solid-state qubit. We observe the interference caused by a pure geometric phase accumulated in the evolution between two consecutive Landau-Zener transitions, while the dynamical phase is canceled out by a spin-echo pulse. The full controllability of the qubit state as a function of the intrinsically robust geometric phase provides a promising approach for quantum state manipulation.

Received 4 April 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.027001

Authors & Affiliations

Xinsheng Tan^1,2, Dan-Wei Zhang³, Zhentao Zhang^1,*, Yang Yu^1,†, Siyuan Han^2,‡, and Shi-Liang Zhu^1,3,§

¹National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China
²Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045, USA
³Laboratory of Quantum Engineering and Quantum Materials, SPTE, South China Normal University, Guangzhou 510006, China

^*Present address: School of Physics Science and Information Engineering, Liaocheng University, Liaocheng 252059,China.
^†yuyang@nju.edu.cn
^‡Han@ku.edu
^§slzhu@scnu.edu.cn

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Vol. 112, Iss. 2 — 17 January 2014

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