Superconducting nanocircuits for topologically protected qubits

被引:119
作者
Gladchenko, Sergey [1 ]
Olaya, David [1 ]
Dupont-Ferrier, Eva [1 ]
Doucot, Benoit [2 ,3 ]
Ioffe, Lev B. [1 ]
Gershenson, Michael E. [1 ]
机构
[1] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA
[2] Univ Paris 06, CNRS, UMR 7589, Phys Theor & Hautes Energies Lab, F-75005 Paris, France
[3] Univ Paris 07, CNRS, UMR 7589, Phys Theor & Hautes Energies Lab, F-75005 Paris, France
基金
美国国家科学基金会;
关键词
QUANTUM; STATE;
D O I
10.1038/NPHYS1151
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
For successful realization of a quantum computer, its building blocks-the individual qubits-should be simultaneously scalable and sufficiently protected from environmental noise. Recently, a novel approach to the protection of superconducting qubits has been proposed. The idea is to prevent errors at the hardware level, by building a fault-free logical qubit from 'faulty' physical qubits with properly engineered interactions between them. The decoupling of such a topologically protected logical qubit from local noises is expected to grow exponentially with the number of physical qubits. Here, we report on proof-of-concept experiments with a prototype device that consists of twelve physical qubits made of nanoscale Josephson junctions. We observed that owing to properly tuned quantum fluctuations, this qubit is protected against magnetic flux variations well beyond linear order, in agreement with theoretical predictions. These results suggest that topologically protected superconducting qubits are feasible.
引用
收藏
页码:48 / 53
页数:6
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