Demonstration of geometric Landau-Zener interferometry in a superconducting qubit.
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.
National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China and Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045, USA.
Xinsheng
X
Tan
Laboratory of Quantum Engineering and Quantum Materials, SPTE, South China Normal University, Guangzhou 510006, China.
Dan-Wei
DW
Zhang
National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.
Zhentao
Z
Zhang
National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.
Yang
Y
Yu
Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045, USA.
Siyuan
S
Han
National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China and Laboratory of Quantum Engineering and Quantum Materials, SPTE, South China Normal University, Guangzhou 510006, China.
Shi-Liang
SL
Zhu