Superconducting Qubit Based on Twisted Cuprate Van der Waals Heterostructures
Superconducting Qubit Based on Twisted Cuprate Van der Waals Heterostructures
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DOI：
10.1103/physrevlett.132.017003
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发表时间：
2024-01-05
影响因子：
8.6
通讯作者：
Vool，Uri
中科院分区：
文献类型：
--
作者：
Brosco，Valentina;Serpico，Giuseppe;Vool，Uri
范德华组装使得能够制造新颖的约瑟夫森结，其特征在于在两个剥落的且相对扭曲的（Bi 2212）薄片之间的原子级尖锐界面。在大约45°的扭转角范围内，结提供了层间双库珀对隧穿主导电流-相位关系的机制。在这里，我们建议利用这种新的结来实现一个电容分流量子比特，我们称之为flowermon。序参量的波动性质赋予了Flowermon对电荷噪声引起的弛豫和准粒子引起的耗散的固有保护。这种内在保护的量子位为基于非常规超导体的新型高相干混合超导量子器件铺平了道路。
Van-der-Waals assembly enables the fabrication of novel Josephson junctions featuring an atomically sharp interface between two exfoliated and relatively twisted(Bi2212) flakes. In a range of twist angles around 45°, the junction provides a regime where the interlayer two-Cooper pair tunneling dominates the current-phase relation. Here we propose employing this novel junction to realize a capacitively shunted qubit that we callflowermon. The-wave nature of the order parameter endows the flowermon with inherent protection against charge-noise-induced relaxation and quasiparticle-induced dissipation. This inherently protected qubit paves the way to a new class of high-coherence hybrid superconducting quantum devices based on unconventional superconductors.