Controlling the spontaneous emission of a superconducting transmon qubit

Autor:	Houck, A. A., Schreier, J. A., Johnson, B. R., Chow, J. M., Koch, Jens, Gambetta, J. M., Schuster, D. I., Frunzio, L., Devoret, M. H., Girvin, S. M., Schoelkopf, R. J.
Rok vydání:	2008
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Superconductivity Quantum Physics
Zdroj:	Phys. Rev. Lett. 101, 080502 (2008)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.101.080502
Popis:	We present a detailed characterization of coherence in seven transmon qubits in a circuit QED architecture. We find that spontaneous emission rates are strongly influenced by far off-resonant modes of the cavity and can be understood within a semiclassical circuit model. A careful analysis of the spontaneous qubit decay into a microwave transmission-line cavity can accurately predict the qubit lifetimes over two orders of magnitude in time and more than an octave in frequency. Coherence times $T_1$ and $T_2^*$ of more than a microsecond are reproducibly demonstrated. Comment: 4 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0803.4490 Zobrazit plný text záznamu View this record from Arxiv