摘要
研究了两个(?)_(1z)(?)_(2z)Ising型耦合量子比特的能级,这是一种典型的赝自旋约瑟夫森结比特模型。论述了两个磁通量子比特通过耦合可以构成量子力学四能级系统;研究了两量子比特间主要因子含能量差ε,隧穿幅度t和耦合因子j(包括耦合强度和耦合方向)对能级的影响。结果表明:对于由两个相同量子比特构成的系统,在Φ=(1/2)Φ处,不仅两抗铁磁态的能级受控于耦合因子,它们之间的跃迁频率也由耦合因子控制。
We investigate the energy levels of two qubits that are coupled via δ^1z ×δ^2z Ising-type of coupling. We demonstrate that two flux qubits can be coupled to form a quantum mechanical four level system. We not only investigate how the energy bias ε and tunneling amplitude t affect the energy levels, but also especially analyze the effect of the coupling factor j （both coupling strength and coupling direction） between two qubits. The results indicate that, for a two identical qubits system, not only the energy level of two antiferromagnetic states but also the transition frequency between them at Ф = （1/2）Ф0 is controlled by the coupling factors.
出处
《量子电子学报》
CAS
CSCD
北大核心
2007年第5期554-560,共7页
Chinese Journal of Quantum Electronics
