| Zugriffsnummer | 53014 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | Demonstration of dual Shapiro steps in small Josephson junctions |
| Autor(in); Institution |
Lotkhov, Sergey; 2.4, Quantenelektronik, PTB-Braunschweig
|
| Quelle/Jahr | Nature Communications: 15 (2024), 1 - 6 |
| Artikelnummer | 8726 |
| Availability | [online only] |
| ISSN | 2041-1723 (online) |
| DOI | |
| Verlag | [London]: Springer Nature |
| Zusammenfassung | Bloch oscillations in small Josephson junctions were predicted theoretically as the quantum dual to Josephson oscillations. A significant consequence of this prediction is the emergence of quantized current steps, so-called dual Shapiro steps, when synchronizing Bloch oscillations to an external microwave signal. These steps potentially enable a fundamental standard of current I, defined via the frequency f of the external signal and the elementary charge e, I=±n×2ef, where n is a natural number. Here, we realize this fundamental relation by synchronizing the Bloch oscillations in small Al/AlOx/Al Josephson junctions to sinusoidal drives with frequencies varying from 1 to 6GHz and observe dual Shapiro steps up to I≈3nA. Inspired by today's voltage standards and to further confirm the duality relation, we investigate a pulsed drive regime, which is dual to the single flux quantum mode of Josephson oscillations, and observe a similar asymmetric pattern of dual Shapiro steps. This work confirms quantum duality effects in Josephson junctions and paves the way towards a range of applications in quantum metrology based on well-established fabrication techniques and straightforward circuit design. |
| Relation |
https://doi.org/10.5281/zenodo.11919737 – (Forschungsdaten [Dataset])
|
| Kostenfreier Zugang | Open Access Gold |
| Rechteinformation | CC BY 4.0 ; Creative Commons Attribution 4.0 License |
| Themenbereich der Metrologie | Elektrizität und Magnetismus |
| Förderinformationen (1) |
Förderername: Deutsche Forschungsgemeinschaft (DFG)
Förderer ID: 0000 0001 2096 9829 Förderer ID Typ: ISNI Förderungsnummer: LO 870/2-1 445530728 |
| Förderinformationen (2) |
Förderername: Deutsche Forschungsgemeinschaft (DFG)
Förderer ID: 0000 0001 2096 9829 Förderer ID Typ: ISNI Förderprogramm: Germany's Excellence Strategy - EXC- 2123 Titel der Förderung: Quantum Frontiers Förderungsnummer: 390837967 |