Spectroscopic Evidence of the Aharonov-Casher Effect in a Cooper Pair Box.
Spectroscopic Evidence of the Aharonov-Casher Effect in a Cooper Pair Box.
复制标题
库珀对盒中阿哈罗诺夫-卡舍尔效应的光谱证据。
DOI：
10.1103/physrevlett.116.107002
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发表时间：
2015
影响因子：
8.6
通讯作者：
Michael Gershenson
中科院分区：
文献类型：
--
作者：
Matthew Bell;Matthew Bell;Wenyuan Zhang;Lev Ioffe;Lev Ioffe;Michael Gershenson
我们观察了阿哈罗诺夫-卡舍尔 (AC) 干扰对包含对称库珀对盒 (CPB) 和大电感的超导系统频谱的影响。通过改变 CPB 岛上感应的电荷 n_{g}，我们观察到器件频谱的振荡，周期为 Δn_{g}=2e。这些振荡归因于 CPB 约瑟夫森结中磁通子隧道过程之间的电荷控制交流干扰。 |0⟩→|1⟩ 和 |0⟩→|2⟩ 跃迁频率的测量相位和电荷依赖性与我们的数值模拟非常一致。对于电荷 n_{g}=e(2n+1)，观察到由于相消干涉而几乎完全抑制了单通量隧道效应。这种状态下的 CPB 能够实现通量子配对，可用于开发受奇偶校验保护的超导量子位。
We observe the effect of the Aharonov-Casher (AC) interference on the spectrum of a superconducting system containing a symmetric Cooper pair box (CPB) and a large inductance. By varying the charge n_{g} induced on the CPB island, we observe oscillations of the device spectrum with the period Δn_{g}=2e. These oscillations are attributed to the charge-controlled AC interference between the fluxon tunneling processes in the CPB Josephson junctions. The measured phase and charge dependences of the frequencies of the |0⟩→|1⟩ and |0⟩→|2⟩ transitions are in good agreement with our numerical simulations. Almost complete suppression of the single fluxon tunneling due to destructive interference is observed for the charge n_{g}=e(2n+1). The CPB in this regime enables fluxon pairing, which can be used for the development of parity-protected superconducting qubits.