The escape rate from the zero voltage state in a superconducting Josephson junction (JJ) is determined by the temperature, but it saturates at low temperature due to macroscopic quantum tunneling (MQT). Complications due to d-wave symmetry in a high temperature superconductor, like low energy quasi- particles and an unconventional current-phase relation, may influence the escape rate. We report, for the first time to our knowledge, the observation of MQT in a YBa2Cu3O7 grain boundary biepitaxial JJ. This proves that dissipation can be significantly reduced by a proper junction configuration, which is of significance for quantum coherence.
Macroscopic quantum tunneling in d-wave YBaCuO Josephson junctions / Bauch, T.; Lombardi, F.; Tafuri, F.; Barone, A.; Rotoli, G.; Delsing, P.; Claeson, T.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 94:(2005), pp. 087003-087006. [10.1103/PhysRevLett.94.087003]
Macroscopic quantum tunneling in d-wave YBaCuO Josephson junctions
F. TAFURI
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2005
Abstract
The escape rate from the zero voltage state in a superconducting Josephson junction (JJ) is determined by the temperature, but it saturates at low temperature due to macroscopic quantum tunneling (MQT). Complications due to d-wave symmetry in a high temperature superconductor, like low energy quasi- particles and an unconventional current-phase relation, may influence the escape rate. We report, for the first time to our knowledge, the observation of MQT in a YBa2Cu3O7 grain boundary biepitaxial JJ. This proves that dissipation can be significantly reduced by a proper junction configuration, which is of significance for quantum coherence.| File | Dimensione | Formato | |
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PhysRevLett.94.087003.pdf
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