Continuous-variable geometric phase and its manipulation for quantum computation in a superconducting circuit
Autor: | Song, Chao, Zheng, Shi-Biao, Zhang, Pengfei, Xu, Kai, Zhang, Libo, Guo, Qiujiang, Liu, Wuxin, Xu, Da, Deng, Hui, Huang, Keqiang, Zheng, Dongning, Zhu, Xiaobo, Wang, H. |
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Rok vydání: | 2017 |
Předmět: | |
Zdroj: | Nature Communications 8, 1061 (2017) |
Druh dokumentu: | Working Paper |
DOI: | 10.1038/s41467-017-01156-5 |
Popis: | 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 multiqubit 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. Comment: 12 pages, 10 figures |
Databáze: | arXiv |
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