| Zugriffsnummer | 26239 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Period-doubling bifurcation readout for a Josephson qubit |
| Autor(in); Institution |
Zorin, Alexander B.; 2.4, Quantenelektronik, PTB-Braunschweig
Makhlin, Yuriy; Landau Institute for Theoretical Physics, Moscow, RUSSIA; Russia and Moscow Institute of Physics and Technology, Dolgoprudny, RUSSIA
|
| Quelle/Jahr | Physical Review B: 83 (2011), 22, 224506-1 - 224506-7 |
| ISSN | 1098-0121 |
| DOI | |
| URL | |
| Verlag | Ridge, NY: American Physical Society |
| Klassifikationscode | PACS: 85.25.Cp ; PACS: 74.50.+r ; PACS: 05.70.Ln ; PACS: 05.45.Gg |
| Zusammenfassung | We propose a threshold detector with an operating principle based on a parametric period-doubling bifurcation in an externally pumped nonlinear resonance circuit. The ac-driven resonance circuit includes a dc-current–biased Josephson junction ensuring parametric frequency conversion (period-doubling bifurcation) due to its quadratic nonlinearity. A sharp onset of oscillations at the half-frequency of the drive allows for the detection of small variations of an effective inductance and, therefore, the readout of the quantum state of a coupled Josephson qubit. The bifurcation characteristics of this circuit are compared with those of the conventional Josephson bifurcation amplifier, and its possible advantages are discussed. |
