| Relation between quantum NOT gate speed and asymmetry of the potential of RF-SQUID |
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| 引用本文： | 嵇英华,蔡十华,胡菊菊. Relation between quantum NOT gate speed and asymmetry of the potential of RF-SQUID[J]. 中国物理 B, 2008, 17(2): 440-444 |
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| 作者姓名： | 嵇英华 蔡十华 胡菊菊 |
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| 作者单位： | Department of Physics, Jiangxi Normal University, Nanchang 330022, China;Key Laboratory of Optoelectronic & Telecommunicationof Jiangxi, Nanchang, 330022, China;Department of Physics, Jiangxi Normal University, Nanchang 330022, China;Department of Physics, Jiangxi Normal University, Nanchang 330022, China |
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| 基金项目： | Project supported by the Scienceand Technology Research Foundation of the Education Department ofJiangxi Province, China (Grant No 200592). |
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| 摘 要： | This paper investigates the relationship between the speed of a quantum not gate and the asymmetry of the potential in an interactive system formed by a two-level RF-SQUID qubit and a classical microwave pulse. The RFSQUID is characterized by an asymmetric double well potential which gives rise to diagonal matrix elements that describe the interaction of the SQUID with the microwave pulse. And the diagonal matrix elements account for the interaction of the microwave pulse with the SQUID. The results indicate that, when the angular frequency of the microwave field is chosen as near resonate with the transition （0） ←→ （1）, i.e. ω1 -ω0 ≈ ωm, （1） the gate speed is decided by three factors, the Rabi frequency, the difference of the diagonal matrix elements between the two levels, and the angular frequency of the applied microwave pulse ωm; （2） the gate speed descends when the asymmetry of the potential is considered.
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| 关 键 词： | 微波脉冲 不对称性 量子学 RF-SQUID |
| 收稿时间： | 2007-02-26 |
| 修稿时间： | 2007-05-29 |
Relation between quantum NOT gate speed and asymmetry of the potential of RF-SQUID |
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| Ji Ying-Hu,Cai Shi-Hua and Hu Ju-Ju. Relation between quantum NOT gate speed and asymmetry of the potential of RF-SQUID[J]. Chinese Physics B, 2008, 17(2): 440-444 |
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| Authors: | Ji Ying-Hu Cai Shi-Hua Hu Ju-Ju |
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| Affiliation: | Department of Physics, Jiangxi Normal University, Nanchang 330022, China; Department of Physics, Jiangxi Normal University, Nanchang 330022, China;Key Laboratory of Optoelectronic & Telecommunicationof Jiangxi, Nanchang, 330022, China |
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| Abstract: | This paper investigates the relationship between the speed of aquantum not gate and the asymmetry of the potential in an interactivesystem formed by a two-level RF-SQUID qubit and a classical microwavepulse. The RF-SQUID is characterized by an asymmetric double wellpotential which gives rise to diagonal matrix elements that describethe interaction of the SQUID with the microwave pulse. And thediagonal matrix elements account for the interaction of the microwavepulse with the SQUID. The results indicate that, when the angularfrequency of the microwave field is chosen as near resonate with thetransition $left| 0 rightrangle leftrightarrow left| 1rightrangle$, i.e. $omega_1-omega_0 approx omega_{rm m}$, (1)the gate speed is decided by three factors, the Rabi frequency, thedifference of the diagonal matrix elements between the two levels,and the angular frequency of the applied microwave pulse $omega_{rm m} $; (2) the gate speed descends when the asymmetry of thepotential is considered. |
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| Keywords: | gate speed asymmetry microwavepulse RF-SQUID |
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