Fast Reset and Suppressing Spontaneous Emission of a Superconducting Qubit

Autor:	Reed, M. D., Johnson, B. R., Houck, A. A., DiCarlo, L., Chow, J. M., Schuster, D. I., Frunzio, L., Schoelkopf, R. J.
Rok vydání:	2010
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Superconductivity
Zdroj:	Appl. Phys. Lett. 96, 203110 (2010)
Druh dokumentu:	Working Paper
DOI:	10.1063/1.3435463
Popis:	Spontaneous emission through a coupled cavity can be a significant decay channel for qubits in circuit quantum electrodynamics. We present a circuit design that effectively eliminates spontaneous emission due to the Purcell effect while maintaining strong coupling to a low-Q cavity. Excellent agreement over a wide range in frequency is found between measured qubit relaxation times and the predictions of a circuit model. Using fast (nanosecond time-scale) flux biasing of the qubit, we demonstrate in situ control of qubit lifetime over a factor of 50. We realize qubit reset with 99.9% fidelity in 120 ns. Comment: 4 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1003.0142 Zobrazit plný text záznamu View this record from Arxiv