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Demonstration of Geometric Landau-Zener Interferometry in a Superconducting Qubit
Tan, Xinsheng Zhang, Dan-Wei Zhang, Zhentao Yu, Yang Han, Siyuan Zhu, Shi-Liang
Tan, Xinsheng
Zhang, Dan-Wei
Zhang, Zhentao
Yu, Yang
Han, Siyuan
Zhu, Shi-Liang
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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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2014-01-17
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American Physical Society
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Xinsheng Tan et al. (2014). Demonstration of Geometric Landau-Zener
Interferometry in a Superconducting Qubit. Phys. Rev. Lett. 112:27001.
http://dx.doi.org/10.1103/PhysRevLett.112.027001