标题： 基于石墨烯的约瑟夫森结中的电调控宏观量子隧穿 显示英文标题

标题： Electrically Tunable Macroscopic Quantum Tunneling in a Graphene-based Josephson Junction

摘要： 随机切换电流分布在一个基于石墨烯的约瑟夫森结中表现出从经典到量子区域的交叉，揭示了在低温下约瑟夫森相位粒子的宏观量子隧穿（MQT）。微波光谱测量表明，通过梳状势阱中的离散能级发生多光子吸收过程。MQT的交叉温度和量子化能级间距由栅极电压控制，暗示其在栅极可调超导量子比特中的潜在应用。 显示英文摘要

摘要： Stochastic switching-current distribution in a graphene-based Josephson junction exhibits a crossover from the classical to quantum regime, revealing the macroscopic quantum tunneling (MQT) of a Josephson phase particle at low temperatures. Microwave spectroscopy measurements indicate a multi-photon absorption process occurring via discrete energy levels in washboard potential well. The crossover temperature for MQT and the quantized level spacing are controlled with the gate voltage, implying its potential application to gate-tunable superconducting quantum bits.