软0-π量子比特的双量子比特门
Two-qubit gates for the soft 0-π qubit
- Beijing Academy of Quantum Information Sciences（北京量子信息科学研究院）
- University of Colorado Boulder（科罗拉多大学博尔德分校）
- The University of Melbourne（墨尔本大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
针对软0-π量子比特，提出一种无保护CZ门，利用计算态与高非计算态直接跃迁，在约160纳秒内实现约99.9%保真度，填补了双量子比特门空白。
AI中文摘要：
0-π量子比特有望比transmon量子比特拥有更长的寿命，使其成为下一代低错误率量子比特的有力候选者。Gyenis等人在软0-π体系中实验演示了无保护的单量子比特门[1]，但尚未提出相应的双量子比特门。我们提出了一种用于电容耦合软0-π量子比特的无保护CZ门。该门利用计算态与更高非计算态之间的直接跃迁。假设器件无序可忽略且采用现象学噪声模型，模拟的CZ门在约160纳秒的门时间内实现了约99.9%的保真度。
英文摘要：
The 0-π qubit promises longer lifetimes than the transmon, making it a strong candidate for a next-generation, lower-error qubit. Gyenis et al. experimentally demonstrated an unprotected single-qubit gate in the soft 0-π regime [1], but no corresponding two-qubit gate has yet been proposed. We propose an unprotected CZ gate for capacitively coupled soft 0-π qubits. The gate uses a direct transition between a computational state and a higher non-computational state. Assuming negligible device disorder and a phenomenological noise model, the simulated CZ gate achieves a fidelity of approximately 99.9% at a gate time of approximately 160 ns.
