Tunneling of fluxons via a Josephson resonant level
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866913466263011328 |
|---|---|
| author | Vakhtel, T. Kurilovich, P. D. Pita-Vidal, M. Bargerbos, A. Fatemi, V. van Heck, B. |
| author_facet | Vakhtel, T. Kurilovich, P. D. Pita-Vidal, M. Bargerbos, A. Fatemi, V. van Heck, B. |
| contents | Fluxons in a superconducting loop can be coherently coupled by quantum phase slips occurring at a weak link such as a Josephson junction. If Cooper pair tunneling at the junction occurs through a resonant level, $2π$ quantum phase slips are suppressed, and fluxons are predominantly coupled by $4π$ quantum phase slips. We analyze this scenario by computing the coupling between fluxons as the level is brought into resonance with the superconducting condensate. The results indicate that the $4π$-dominated regime can be observed directly in the transition spectrum for circuit parameters typical of a fluxonium qubit. We also show that, if the inductive energy of the loop is much smaller than the plasma frequency of the junction, the low-energy Hamiltonian of the circuit is dual to that of a topological superconducting island. These findings can inform experiments on bifluxon qubits as well as the design of novel types of protected qubits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_03102 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Tunneling of fluxons via a Josephson resonant level Vakhtel, T. Kurilovich, P. D. Pita-Vidal, M. Bargerbos, A. Fatemi, V. van Heck, B. Mesoscale and Nanoscale Physics Superconductivity Quantum Physics Fluxons in a superconducting loop can be coherently coupled by quantum phase slips occurring at a weak link such as a Josephson junction. If Cooper pair tunneling at the junction occurs through a resonant level, $2π$ quantum phase slips are suppressed, and fluxons are predominantly coupled by $4π$ quantum phase slips. We analyze this scenario by computing the coupling between fluxons as the level is brought into resonance with the superconducting condensate. The results indicate that the $4π$-dominated regime can be observed directly in the transition spectrum for circuit parameters typical of a fluxonium qubit. We also show that, if the inductive energy of the loop is much smaller than the plasma frequency of the junction, the low-energy Hamiltonian of the circuit is dual to that of a topological superconducting island. These findings can inform experiments on bifluxon qubits as well as the design of novel types of protected qubits. |
| title | Tunneling of fluxons via a Josephson resonant level |
| topic | Mesoscale and Nanoscale Physics Superconductivity Quantum Physics |
| url | https://arxiv.org/abs/2310.03102 |