Continuous-variable geometric phase and its manipulation for quantum computation in a superconducting circuit

被引：74

作者：

Song, Chao ^{[1
]}

Zheng, Shi-Biao ^{[2
]}

Zhang, Pengfei ^{[1
]}

Xu, Kai ^{[1
]}

Zhang, Libo ^{[1
]}

Guo, Qiujiang ^{[1
]}

Liu, Wuxin ^{[1
]}

Xu, Da ^{[1
]}

Deng, Hui ^{[3
]}

Huang, Keqiang ^{[3
,5
]}

Zheng, Dongning ^{[3
,5
]}

Zhu, Xiaobo ^{[3
,4
]}

Wang, H. ^{[1
,4
]}

机构：

[1] Zhejiang Univ, Dept Phys, Hangzhou 310027, Zhejiang, Peoples R China

[2] Fuzhou Univ, Coll Phys & Informat Engn, Fujian Key Lab Quantum Informat & Quantum Opt, Fuzhou 350116, Fujian, Peoples R China

[3] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[4] Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Hefei 230026, Anhui, Peoples R China

[5] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China

来源：

NATURE COMMUNICATIONS | 2017年 / 8卷

关键词：

EXPERIMENTAL REALIZATION; BERRYS PHASE; QUBIT; GATES; RESONANCE; SPIN;

D O I：

10.1038/s41467-017-01156-5

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Geometric phase, associated with holonomy transformation in quantum state space, is an important quantum-mechanical effect. Besides fundamental interest, this effect has practical applications, among which geometric quantum computation is a paradigm, where quantum logic operations are realized through geometric phase manipulation that has some intrinsic noise-resilient advantages and may enable simplified implementation of multi-qubit gates compared to the dynamical approach. Here we report observation of a continuous-variable geometric phase and demonstrate a quantum gate protocol based on this phase in a superconducting circuit, where five qubits are controllably coupled to a resonator. Our geometric approach allows for one-step implementation of n-qubit controlled-phase gates, which represents a remarkable advantage compared to gate decomposition methods, where the number of required steps dramatically increases with n. Following this approach, we realize these gates with n up to 4, verifying the high efficiency of this geometric manipulation for quantum computation.

引用

页数：7

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