Demonstration of Geometric Landau-Zener Interferometry in a Superconducting Qubit
Xinsheng Tan, Dan-Wei Zhang, Zhentao Zhang, Yang Yu, Siyuan Han, Shi-Liang Zhu
DOI 10.1103/PhysRevLett.112.027001 · Physical Review Letters
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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.
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