title: Electrically tunable macroscopic quantum tunneling in a graphene-based Josephson junction.
abstract: Stochastic switching-current distribution in a graphene-based Josephson junction exhibits a crossover from the classical to quantum regime, revealing the macroscopic quantum tunneling of a Josephson phase particle at low temperatures. Microwave spectroscopy measurements indicate a multiphoton absorption process occurring via discrete energy levels in washboard potential well. The crossover temperature for macroscopic quantum tunneling and the quantized level spacing are controlled with the gate voltage, implying its potential application to gate-tunable superconducting quantum bits.
authors: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.
authors: Gil-Ho
authors: GH
authors: Lee
authors: Dongchan
authors: D
authors: Jeong
authors: Jae-Hyun
authors: JH
authors: Choi
authors: Yong-Joo
authors: YJ
authors: Doh
authors: Hu-Jong
authors: HJ
authors: Lee