Protected Josephson Rhombus Chains

被引：71

作者：

Bell, Matthew T. ^{[1
]}

Paramanandam, Joshua ^{[1
]}

Ioffe, Lev B. ^{[1
,2
]}

Gershenson, Michael E. ^{[1
]}

机构：

[1] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[2] CNRS, LPTHE, UMR 7589, F-75252 Paris, France

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 16期

关键词：

Quantum computers - Excited states;

D O I：

10.1103/PhysRevLett.112.167001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied the low-energy excitations in a minimalistic protected Josephson circuit which contains two basic elements (rhombi) characterized by the p periodicity of the Josephson energy. Novel design of these elements, which reduces their sensitivity to the offset charge fluctuations, has been employed. We have observed that the lifetime T-1 of the first excited state of this quantum circuit in the protected regime is increased up to 70 mu s, a factor of similar to 100 longer than that in the unprotected state. The quality factor omega(01) T-1 of this qubit exceeds 10(6). Our results are in agreement with theoretical expectations; they demonstrate the feasibility of symmetry protection in the rhombus-based qubits fabricated with existing technology.

引用

页数：5

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