期刊
PHYSICAL REVIEW B
卷 80, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.214535
关键词
eigenvalues and eigenfunctions; harmonic oscillators; Josephson effect; oscillators; quantum computing; SQUIDs
资金
- EU
- DFG (German Science Foundation) [ZO124/2-1]
We propose a superconducting phase qubit on the basis of the radio-frequency superconducting quantum interference device with the screening parameter value beta(L)equivalent to(2 pi/Phi(0))LIc approximate to 1, biased by a half-flux quantum Phi(e)=Phi(0)/2. Significant anharmonicity (>30%) can be achieved in this system due to the interplay of the cosine Josephson potential and the parabolic magnetic energy potential that ultimately leads to the quartic polynomial shape of the well. The two lowest eigenstates in this global minimum perfectly suit for the qubit which is insensitive to the charge variable, biased in the optimal point and allows an efficient dispersive readout. Moreover, the transition frequency in this qubit can be tuned within an appreciable range allowing variable qubit-qubit coupling.
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