| Zugriffsnummer | 47157 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | Driving a low critical current Josephson junction array with a mode-locked laser |
| Autor(in); Institution |
Nissilä, J.; VTT Technical Research Centre of Finland Ltd, Espoo, FINLAND
Fordell, T.; VTT Technical Research Centre of Finland Ltd, Espoo, FINLAND
Kohopää, K.; VTT Technical Research Centre of Finland Ltd, Espoo, FINLAND
Mykkänen, E.; VTT Technical Research Centre of Finland Ltd, Espoo, FINLAND
Immonen, P.; VTT Technical Research Centre of Finland Ltd, Espoo, FINLAND
Jabdaraghi, R.; VTT Technical Research Centre of Finland Ltd, Espoo, FINLAND
Bardalen, E.; University of South-Eastern Norway, Borre, NORWAY
Kieler, Oliver; 2.4, Quantenelektronik, PTB-Braunschweig
Karlsen, B.; Justervesenet, Keller, NORWAY
Ohlckers, P.; University of South-Eastern Norway, Borre, NORWAY
Behr, Ralf; 2.6, Elektrische Quantenmetrologie, PTB-Braunschweig
Manninen, A.; VTT Technical Research Centre of Finland Ltd, Espoo, FINLAND
Govenius, J.; VTT Technical Research Centre of Finland Ltd, Espoo, FINLAND
Kemppinen, A.; VTT Technical Research Centre of Finland Ltd, Espoo, FINLAND
|
| Quelle/Jahr | Applied Physics Letters: 119 (2021), 3, 032601-1 - 032601-4 |
| Artikelnummer | 032601 |
| ISSN | 0003-6951 (PRINT) ; 1077-3118 (ONLINE) |
| DOI | |
| Verlag | Melville, NY: American Institute of Physics (AIP) |
| Zusammenfassung | We report proof-of-concept experiments on an optically driven Josephson voltage standard based on a mode-locked laser (MLL), a timedivision multiplexer, and a cryogenic ultrafast photodiode driving an overdamped Josephson junction array (JJA). Our optical pulse pattern generator (PPG) concept builds on the capability of MLLs to produce trains of picosecond-wide optical pulses with little amplitude and temporal spread. Our present setup enables multiplication of the original 2.3 GHz pulse repetition frequency by a factor of 8. A commercial photodiode converts the optical pulses into about 25 ps wide electrical pulses in liquid helium several cm from the JJA. Using a custom-made MLL, we can drive a JJA with a low critical current of 360 lA at multiple Shapiro steps. We have performed experiments with pulse pairs whose time interval can be set freely without distorting the shapes of individual pulses. Experimental results are in qualitative agreement with theoretical simulations, and they demonstrate, e.g., crossover in the Shapiro step pattern when the time interval between the pulses is approximately equal to the inverse of the characteristic frequency of the JJA. However, there are quantitative discrepancies, which motivate an improved integration of photodiodes and JJAs to improve both the understanding and fidelity of Josephson Arbitrary Waveform Synthesizers. Considering future quantum technologies in a wider perspective, our optical approach is a potential enabler for fast and energy-efficient pulse drive without an expensive high-bandwidth electrical PPG and without high-bandwidth electrical cables that yield too high thermal conductance between cryogenic and room temperatures. |
| Kostenfreier Zugang | Open Access Hybrid |
| Rechteinformation | CC BY 4.0 ; Creative Commons Attribution 4.0 License |
| Themenbereich der Metrologie | Elektrizität und Magnetismus |
Zitierung
Nissilä, J., Fordell, T., Kohopää, K., Mykkänen, E., Immonen, P., Jabdaraghi, R., Bardalen, E., Kieler, O., Karlsen, B., Ohlckers, P., Behr, R., Manninen, A., Govenius, J., & Kemppinen, A. (2021). Driving a low critical current Josephson junction array with a mode-locked laser. Applied Physics Letters, 119(3), 032601-1–032601-4. https://doi.org/10.1063/5.0060804