当前位置: X-MOL 学术Phys. Rev. X › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Fast Logic with Slow Qubits: Microwave-Activated Controlled-Z Gate on Low-Frequency Fluxoniums
Physical Review X ( IF 12.5 ) Pub Date : 2021-05-03 , DOI: 10.1103/physrevx.11.021026
Quentin Ficheux , Long B. Nguyen , Aaron Somoroff , Haonan Xiong , Konstantin N. Nesterov , Maxim G. Vavilov , Vladimir E. Manucharyan

We demonstrate a controlled-Z gate between capacitively coupled fluxonium qubits with transition frequencies 72.3 and 136.3 MHz. The gate is activated by a 61.6-ns-long pulse at a frequency between noncomputational transitions |10|20 and |11|21, during which the qubits complete only four and eight Larmor periods, respectively. The measured gate error of (8±1)×103 is limited by decoherence in the noncomputational subspace, which will likely improve in the next-generation devices. Although our qubits are about 50 times slower than transmons, the two-qubit gate is faster than microwave-activated gates on transmons, and the gate error is on par with the lowest reported. Architectural advantages of low-frequency fluxoniums include long qubit coherence time, weak hybridization in the computational subspace, suppressed residual ZZ-coupling rate (here 46 kHz), and the absence of either excessive parameter-matching or complex pulse-shaping requirements.

中文翻译:

慢量子位的快速逻辑:低频通量的微波激活的受控Z门

我们演示了电容性耦合通量量子位之间的受控Z门,其跃迁频率为72.3和136.3 MHz。该门由61.6 ns长的脉冲以非计算转换之间的频率激活|10-|20|11-|21岁,在此期间,量子位分别仅完成四个和八个拉莫尔周期。测得的门极误差8±1个×10-3受到非计算子空间中去相干性的限制,这可能会在下一代设备中得到改善。尽管我们的量子比特比转基因慢大约50倍,但两个量子比特的门比转基因上的微波激活门快,并且门误差与报道的最低值相当。低频通量子的结构优势包括长量子位相干时间,计算子空间中的弱杂交,抑制残差žž-耦合速率(此处为46 kHz),并且没有过多的参数匹配或复杂的脉冲整形要求。
更新日期:2021-05-03
down
wechat
bug