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Observation of geometric phase in a dispersively coupled resonator-qutrit system |
| Libo Zhang(张礼博)1, Chao Song(宋超)1, H Wang(王浩华)1, Shi-Biao Zheng(郑仕标)2 |
1 Department of Physics, Zhejiang University, Hangzhou 310027, China;
2 Fujian Key Laboratory of Quantum Information and Quantum Optics, College of Physics and Information Engineering, Fuzhou University, Fuzhou 350116, China |
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Abstract We present an experiment of observing the geometric phase in a superconducting circuit where the resonator and the qutrit energy levels are dispersively coupled. The drive applied to the resonator displaces its state components associated with the qutrit's ground state and first-excited state along different circular trajectories in phase space. We identify the resonator's phase-space trajectories by Wigner tomography using an ancilla qubit, following which we observe the difference between the geometric phases associated with these trajectories using Ramsey interferometry. This geometric phase is further used to construct the single-qubit π-phase gate with a process fidelity of 0.851±0.001.
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Received: 04 March 2018
Revised: 26 April 2018
Accepted manuscript online:
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PACS:
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03.65.Vf
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(Phases: geometric; dynamic or topological)
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03.67.Lx
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(Quantum computation architectures and implementations)
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42.50.Pq
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(Cavity quantum electrodynamics; micromasers)
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| Fund: Project supported by the National Basic Research Program of China (Grant No. 2014CB921201) and the National Natural Science Foundation of China (Grant Nos. 11434008 and 11574380). |
Corresponding Authors:
H Wang, Shi-Biao Zheng
E-mail: hhwang@zju.edu.cn;t96034@fzu.edu.cn
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Cite this article:
Libo Zhang(张礼博), Chao Song(宋超), H Wang(王浩华), Shi-Biao Zheng(郑仕标) Observation of geometric phase in a dispersively coupled resonator-qutrit system 2018 Chin. Phys. B 27 070303
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