High Fidelity Qubit Readout with the Superconducting Low-Inductance Undulatory Galvanometer Microwave Amplifier

Autor:	Hover, D., Zhu, S., Thorbeck, T., Ribeill, G. J., Sank, D., Kelly, J., Barends, R., Martinis, John M., McDermott, R.
Rok vydání:	2013
Předmět:	Condensed Matter - Superconductivity Quantum Physics
Druh dokumentu:	Working Paper
DOI:	10.1063/1.4871088
Popis:	We describe the high fidelity dispersive measurement of a superconducting qubit using a microwave amplifier based on the Superconducting Low-inductance Undulatory Galvanometer (SLUG). The SLUG preamplifier achieves gain of 19 dB and yields a signal-to-noise ratio improvement of 9 dB over a state-of-the-art HEMT amplifier. We demonstrate a separation fidelity of 99% at 700 ns compared to 59% with the HEMT alone. The SLUG displays a large dynamic range, with an input saturation power corresponding to 700 photons in the readout cavity. Comment: 10 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1312.7579 Zobrazit plný text záznamu View this record from Arxiv