| Zugriffsnummer | 21083 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | Low-noise RSFQ circuits for a Josephson qubit control |
| Autor(in); Institution |
Khabipov, Marat I.; 2.4, Quantenelektronik, PTB-Braunschweig
Balashov, Dimitry V.; 2.4, Quantenelektronik, PTB-Braunschweig
Tolkacheva, Elena M.; 2.4, Quantenelektronik, PTB-Braunschweig
Zorin, Alexander B.; 2.4, Quantenelektronik, PTB-Braunschweig
|
| Quelle/Jahr | Journal of Physics: Conference series: 97 (2008), 1 - 6 |
| Artikelnummer | 012041 |
| ISSN | 1742-6588 (PRINT) ; 1742-6596 (ONLINE) |
| DOI | |
| Verlag | Bristol: IOP |
| Konferenzangaben | 8th European Conference on Applied Superconductivity, Brussels, 16-20, September, 2007, Belgium |
| Freie Schlagworte | RSFQ digital circuits ; Damping and decoherence ; Josephson qubit control |
| Zusammenfassung | We address the problem of reducing the noise of an RSFQ circuit, which may significantly decohere a Josephson qubit in the case of integration of these circuits. The main sources of such noise in traditional RSFQ circuits are low-ohmic shunting resistors ensuring sufficiently high damping. We developed the toggle flip-flop (TFF) cells with weakly-damped individual junctions due to high-ohmic shunts. The dominant part of necessary damping in this circuit was realized by applying an additional, so-called "perpendicular", low-ohmic resistor connecting the centre of the storing TFF inductance to ground. The TFF circuits with junctions shunted by 50 Ω resistors and perpendicular resistor of 1.5 Ω, ensuring suppression of noise by more than one order, have been fabricated and demonstrated an operation range of ± 20%. In order to make the circuit compact and, therefore, less sensitive to external noise, the passive frozen-flux-based phase shifting elements, replacing large quantizing inductances, were also included. The circuits were fabricated using PTB Nb trilayer process with critical current density jc = 100 A/cm². |
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