论文标题
重新评估约瑟夫森交界处宏观量子隧道的证据
A Reassessment of the Evidence for Macroscopic Quantum Tunneling in a Josephson Junction
论文作者
论文摘要
几十年来，切换当前的分布一直是研究约瑟夫森连接的必不可少的诊断工具。他们在测试Millikelvin温度连接处的宏观量子状态的猜想中发挥了关键作用。该测试的常规基础是观察到SCD峰宽度的温度独立性，这导致了关于交叉的肯定结论。这里提出了不同的标准 - SCD峰与连接临界电流的距离，并证明了其功效。该测试在精度方面具有明显的优势，发现在三个实验中，对猜想的宏观量子状态的交叉证据无疑是负面的。考虑了这一发现对超导码头的含义。
Switching current distributions have for decades been an indispensable diagnostic tool for studying Josephson junctions. They have played a key role in testing the conjecture of a macroscopic quantum state in junctions at millikelvin temperatures. The conventional basis of the test has been the observation of temperature independence of SCD peak widths, and that led to affirmative conclusions about a crossover. A different criterion is proposed here - the distance of the SCD peak from the junction critical current - and its efficacy is demonstrated. This test has distinct advantages in terms of precision, and it is found that, for three example experiments, the evidence for a crossover to the conjectured macroscopic quantum state is unequivocally negative. The implications of this finding for superconducting qubits are considered.
