Decoherence in Josephson phase qubits from Junction resonators

被引：385

作者：

Simmonds, RW ^{[1
]}

Lang, KM ^{[1
]}

Hite, DA ^{[1
]}

Nam, S ^{[1
]}

Pappas, DP ^{[1
]}

Martinis, JM ^{[1
]}

机构：

[1] Natl Inst Stand & Technol, Boulder, CO 80305 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.93.077003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Although Josephson junction qubits show great promise for quantum computing, the origin of dominant decoherence mechanisms remains unknown. Improving the operation of a Josephson junction based phase qubit has revealed microscopic two-level systems or resonators within the tunnel barrier that cause decoherence. We report spectroscopic data that show a level splitting characteristic of coupling between a two-state qubit and a two-level system. Furthermore, we show Rabi oscillations whose "coherence amplitude" is significantly degraded by the presence of these spurious microwave resonators. The discovery of these resonators impacts the future of Josephson qubits as well as existing Josephson technologies.

引用

页码：077003 / 1

页数：4

共 23 条

[21] Manipulating the quantum state of an electrical circuit [J].