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具有高相干性和快速可调耦合的量子比特架构

Qubit Architecture with High Coherence and Fast Tunable Coupling.

作者信息

Chen Yu, Neill C, Roushan P, Leung N, Fang M, Barends R, Kelly J, Campbell B, Chen Z, Chiaro B, Dunsworth A, Jeffrey E, Megrant A, Mutus J Y, O'Malley P J J, Quintana C M, Sank D, Vainsencher A, Wenner J, White T C, Geller Michael R, Cleland A N, Martinis John M

机构信息

Department of Physics, University of California, Santa Barbara, California 93106-9530, USA.

Department of Physics, University of California, Santa Barbara, California 93106-9530, USA and Department of Materials, University of California, Santa Barbara, California 93106-5050, USA.

出版信息

Phys Rev Lett. 2014 Nov 28;113(22):220502. doi: 10.1103/PhysRevLett.113.220502. Epub 2014 Nov 26.

Abstract

We introduce a superconducting qubit architecture that combines high-coherence qubits and tunable qubit-qubit coupling. With the ability to set the coupling to zero, we demonstrate that this architecture is protected from the frequency crowding problems that arise from fixed coupling. More importantly, the coupling can be tuned dynamically with nanosecond resolution, making this architecture a versatile platform with applications ranging from quantum logic gates to quantum simulation. We illustrate the advantages of dynamical coupling by implementing a novel adiabatic controlled-z gate, with a speed approaching that of single-qubit gates. Integrating coherence and scalable control, the introduced qubit architecture provides a promising path towards large-scale quantum computation and simulation.

摘要

我们介绍了一种超导量子比特架构,它结合了高相干性量子比特和可调谐的量子比特-量子比特耦合。通过能够将耦合设置为零,我们证明了这种架构可以避免因固定耦合而产生的频率拥挤问题。更重要的是,耦合可以以纳秒分辨率动态调谐,使这种架构成为一个多功能平台,其应用范围从量子逻辑门到量子模拟。我们通过实现一种新型绝热受控-Z门来说明动态耦合的优势,其速度接近单量子比特门。集成了相干性和可扩展控制,所介绍的量子比特架构为大规模量子计算和模拟提供了一条有前景的途径。

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