Quantum dynamics in a camelback potential of a dc SQUID.
Quantum dynamics in a camelback potential of a dc SQUID.
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直流 SQUID 驼背势的量子动力学。
DOI：
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发表时间：
2008
影响因子：
8.6
通讯作者：
A. Zorin
中科院分区：
文献类型：
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作者：
E. Hoskinson;F. Lecocq;N. Didier;A. Fay;F. Hekking;W. Guichard;O. Buisson;R. Dolata;B. Mackrodt;A. Zorin
我们研究了由两个势垒之间的势阱形成的二次-四次非谐振子。我们在接近零电流偏置和接近半通量量子的通量偏置下实现了直流SQUID的这种新潜力。通过钻穿两个屏障中的任何一个，可以从中央井中逃生。结果与广义双路宏观量子隧穿理论吻合良好。我们还展示了电流和通量偏置的“最佳线”，沿着这条线，振荡器可以作为相位量子位运行，对低频电流波动引起的退相干不敏感。
We investigate a quadratic-quartic anharmonic oscillator formed by a potential well between two potential barriers. We realize this novel potential with a dc SQUID at near-zero current bias and flux bias near half a flux quantum. Escape out of the central well can occur via tunneling through either of the two barriers. We find good agreement with a generalized double-path macroscopic quantum tunneling theory. We also demonstrate an "optimal line" in current and flux bias along which the oscillator, which can be operated as a phase qubit, is insensitive to decoherence due to low-frequency current fluctuations.