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18 February 2025
 
  » arxiv » 1109.0110

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Electrically Tunable Macroscopic Quantum Tunneling in a Graphene-based Josephson Junction
Gil-Ho Lee ; Dongchan Jeong ; Jae-Hyun Choi ; Yong-Joo Doh ; Hu-Jong Lee ;
Date 1 Sep 2011
AbstractStochastic 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.
Source arXiv, 1109.0110
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