Effects of a resonant cavity on macroscopic quantum tunneling of fluxons in long Josephson junctions
Ju H. Kim, Ramesh P. Dhungana
DOI 10.1103/PhysRevB.83.064503 · Physical Review B
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Abstract
We investigate the effects of a high-quality resonant cavity on macroscopic quantum tunneling (MQT) of fluxons from both a metastable state to continuum and from one degenerate ground state of a double-well potential to the other. By using a set of two coupled perturbed sine-Gordon equations, we describe the tunneling processes in linear long Josephson junctions and find that MQT in the resonant cavity increases due to potential renormalization, induced by the interaction between the fluxon and the cavity. Enhancement of the MQT rate in the weak-coupling regime is estimated by using the experimentally accessible range of the model parameters. The tunneling rate from the metastable state is found to increase weakly with increasing junction-cavity interaction strength. However, the energy splitting between the two degenerate ground states of the double-well potential increases significantly with increasing both the interaction strength and the frequency of the resonant cavity mode. Finally, we discuss how the resonant cavity may be used to tune the property of Josephson vortex quantum bits.
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| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb-AlOx-Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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