Zener enhancement of quantum tunneling in a two-level superconducting circuit

Zener enhancement of quantum tunneling in a two-level superconducting circuit

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 well. The MQT escape rate of such a particle was recently predicted to be strongly modified whe...

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Veröffentlicht in:Physical review letters 2006-01, Vol.94, p.057004
Hauptverfasser: Ithier, G., Collin, E., Joyez, P., Vion, D., Estève, Daniel, Ankerhold, J., Grabert, H.
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container_title Physical review letters
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creator Ithier, G.
Collin, E.
Joyez, P.
Vion, D.
Estève, Daniel
Ankerhold, J.
Grabert, H.
description 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 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.
doi_str_mv 10.1103/PhysRevLett.96.029901
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Physics
title Zener enhancement of quantum tunneling in a two-level superconducting circuit
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