SQUID磁通量子比特的深阱超快操纵
Deep-well ultrafast manipulation of a SQUID flux qubit
摘要：
基于约瑟夫森效应的超导器件被有效地用于实现量子比特和量子门。超导量子比特的操纵通常通过使用频率从5到15 GHz的微波脉冲来执行，获得从100 MHz到1 GHz的典型操作时钟。在没有微波的情况下基于简单脉冲的操纵也是可能的。在我们的系统中，一个磁通量脉冲将双SQUID量子位的势从对称的双阱条件修改为单深阱条件。通过使用该方案与Nb/AlOx/Nb系统，我们获得了具有亚纳秒周期（从50 ps到200 ps可调谐）的相干振荡，相对于其他操纵程序非常快，并且相干时间高达10 ns，与使用类似设备和技术但使用微波操纵获得的相干振荡的量级。我们介绍了超快操纵呈现实验结果，与这种方法相关的新问题（如使用反馈程序来消除“慢”波动的影响），以及开放的观点，如可能使用RSFQ逻辑进行量子位控制。
英文摘要：
Superconducting devices based on the Josephson effect are effectively used for the implementation of qubits and quantum gates. The manipulation of superconducting qubits is generally performed by using microwave pulses with frequencies from 5 to 15 GHz, obtaining a typical operating clock from 100MHz to 1GHz. A manipulation based on simple pulses in the absence of microwaves is also possible. In our system a magnetic flux pulse modifies the potential of a double SQUID qubit from a symmetric double well to a single deep well condition. By using this scheme with a Nb/AlOx/Nb system we obtained coherent oscillations with sub-nanosecond period (tunable from 50ps to 200ps), very fast with respect to other manipulating procedures, and with a coherence time up to 10ns, of the order of what obtained with similar devices and technologies but using microwave manipulation. We introduce the ultrafast manipulation presenting experimental results, new issues related to this approach (such as the use of a feedback procedure for cancelling the effect of "slow" fluctuations), and open perspectives, such as the possible use of RSFQ logic for the qubit control.
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