平面几何结构中的长寿命、辐射抑制超导量子比特
Long-lived, radiation-suppressed superconducting quantum bit in a planar geometry
摘要：
我们提出了一个超导量子位的设计，是在一个超导接地平面上的二维几何结构，以提高寿命。量子位耦合到微带谐振器用于读出。该电路是在硅衬底上制造的，使用低损耗，化学计量氮化钛的电容器焊盘和小，阴影蒸发铝/氧化铝结。我们观察到量子位弛豫和相干时间（$T_1$和$T_2$）分别为11.7 $\pm$ 0.2 $μ$ s和8.7 $\pm$ 0.3 $μ$ s。计算表明，超导平面的接近抑制了量子比特的高辐射损耗。一个显着增加$T_1$预计减少量子位超导平面分离。
英文摘要：
We present a superconducting qubit design that is fabricated in a 2D geometry over a superconducting ground plane to enhance the lifetime. The qubit is coupled to a microstrip resonator for readout. The circuit is fabricated on a silicon substrate using low loss, stoichiometric titanium nitride for capacitor pads and small, shadow-evaporated aluminum/aluminum-oxide junctions. We observe qubit relaxation and coherence times ($T_1$ and $T_2$) of 11.7 $\pm$ 0.2 $μ$s and 8.7 $\pm$ 0.3 $μ$s, respectively. Calculations show that the proximity of the superconducting plane suppresses the otherwise high radiation loss of the qubit. A significant increase in $T_1$ is projected for a reduced qubit-to-superconducting plane separation.
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