Dependence of Switching Current Distribution of a Current-Biased Josephson Junction on Microwave Frequency

作者：Zhai Ji-Quan; Li Yong-Chao; Shi Jian-Xin; Zhou Yu; Li Xiao-Hu; Xu Wei-Wei^*; Sun Guo-Zhu; Wu Pei-Heng

来源：Chinese Physics Letters, 2015, 32(4): 047402.

DOI：10.1088/0256-307X/32/4/047402

• ZERO-VOLTAGE STATE
• ENERGY-LEVEL QUANTIZATION
• MACROSCOPIC QUANTUM STATES
• TUNNEL-JUNCTIONS
• QUBIT APPLICATION
• FABRICATION
• DISSIPATION
• LIFETIME
• FIELD

We investigate the distribution of the switching current of a current-biased Josephson junction (CBJJ) and its dependence on the microwave frequency using two theoretical methods, one of which is the quantum trajectory method and the other is the master equation method. Both the methods show that the distribution of the switching current of CBJJ will exhibit double peaks in a certain range of microwave frequency if proper microwave power is given, and the gap between the two peaks will increase with the microwave frequency. The obtained results can be used to identify the energy difference of the ground and first excited states in a Josephson junction for any bias current.

• 出版日期2015-4
• 单位南京大学