Concentric transmon qubit featuring fast tunability and an anisotropic magnetic dipole moment
Concentric transmon qubit featuring fast tunability and an anisotropic magnetic dipole moment
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DOI：
10.1063/1.4940230
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发表时间：
2016-01-18
影响因子：
4
通讯作者：
Pappas, David P.
中科院分区：
文献类型：
--
作者：
Braumueller, Jochen;Sandberg, Martin;Pappas, David P.
我们提出了一种基于超导电路的平面量子比特设计，我们称之为同心传输。在采用Al蒸发和起飞光刻的直接制造工艺时，我们观察到量子位寿命和相干时间在10 μ s左右。我们系统地表征了损耗通道，如非相干介电损耗、Purcell衰减和辐射损耗。梯度SQUID环路的实现允许快速调整量子位跃迁频率，因此可以对量子电路进行完全层析控制。由于环路尺寸大，与传统的transmon设计相比，所提出的量子比特架构具有显著增加的磁偶极矩。这使得同心传输成为在相邻量子位之间建立位置选择性被动直接(Z) over cap耦合的有希望的候选者，这是量子模拟领域的一个悬而未决的问题。(C) 2016 AIP出版有限责任公司
We present a planar qubit design based on a superconducting circuit that we call concentric transmon. While employing a straightforward fabrication process using Al evaporation and lift-off lithography, we observe qubit lifetimes and coherence times in the order of 10 mu s. We systematically characterize loss channels such as incoherent dielectric loss, Purcell decay and radiative losses. The implementation of a gradiometric SQUID loop allows for a fast tuning of the qubit transition frequency and therefore for full tomographic control of the quantum circuit. Due to the large loop size, the presented qubit architecture features a strongly increased magnetic dipole moment as compared to conventional transmon designs. This renders the concentric transmon a promising candidate to establish a site-selective passive direct (Z) over cap coupling between neighboring qubits, being a pending quest in the field of quantum simulation. (C) 2016 AIP Publishing LLC.