Tunable impedance environment for quantum phase slip experiments
ORAL
Abstract
Tunneling of magnetic vortices through a thin superconducting nanowire, i.e. quantum phase slips (QPS), can cause an insulating transition instead of the typical zero resistance state. This phenomenon is dual to Cooper pair tunneling in a Josephson junction with quantum conjugate variables the phase and the charge exchanged. The QPS nanowire may allow the realization of a very precise quantum current standard. Although the experimental realization of coherent QPS was reported [1], only weak reverse Shapiro effect-like features in superconducting nanowires were observed so far [2].
Using our millikelvin-operational silicon MOSFET platform [3], we realize an integrated tunable impedance environment for ultra-thin TiN and NbN superconducting nanowires. We present experimental QPS data, compare it with recent theoretical predictions [4], and determine the effect of the cryogenic microwave background on a QPS system [5].
The research is supported by the EU H2020 grants No 862660 & 824109 and the Academy of Finland (Centre of Excellence program: projects 336817 & 312294).
[1] Nature 484, 355–358 (2012)
[2] Phys. Rev. Lett. 109, 187001 (2012); App. Phys. Lett., 114, 242601 (2019)
[3] Appl. Phys. Lett. 118, 164002 (2021)
[4] Phys. Rev. B 102, 144509 (2020)
[5] Phys. Rev. B 85, 012504 (2012)
Using our millikelvin-operational silicon MOSFET platform [3], we realize an integrated tunable impedance environment for ultra-thin TiN and NbN superconducting nanowires. We present experimental QPS data, compare it with recent theoretical predictions [4], and determine the effect of the cryogenic microwave background on a QPS system [5].
The research is supported by the EU H2020 grants No 862660 & 824109 and the Academy of Finland (Centre of Excellence program: projects 336817 & 312294).
[1] Nature 484, 355–358 (2012)
[2] Phys. Rev. Lett. 109, 187001 (2012); App. Phys. Lett., 114, 242601 (2019)
[3] Appl. Phys. Lett. 118, 164002 (2021)
[4] Phys. Rev. B 102, 144509 (2020)
[5] Phys. Rev. B 85, 012504 (2012)
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Presenters
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Heorhii Bohuslavskyi
- VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, FI-02044 VTT, Espoo, Finland
- NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan (current address: VTT Technical Research Centre of Finland Ltd., 02044 Espoo, Finland)