Zener enhancement of quantum tunneling in a two-level superconducting circuit |
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Authors: | Ithier G Collin E Joyez P Vion D Esteve D Ankerhold J Grabert H |
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Institution: | Quantronics group, Service de Physique de l'Etat Condensé, DSM/DRECAM, CEA Saclay, 91191 Gif-sur-Yvette, France. |
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Abstract: | We have investigated the macroscopic quantum tunneling (MQT) of the phase across a Josephson junction embedded in a superconducting circuit. This system is equivalent to a spin 1/2 particle in a potential energy well. The MQT escape rate of such a particle was recently predicted to be strongly modified when a crossing of its inner Zeeman levels occurs while tunneling. In this regime, we observe a significant enhancement of the MQT rate and compare it to theory. |
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