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arXiv 2408.16617quant-ph
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通过超导量子比特中谐振器诱导相位实现的长程 $ZZ$ 相互作用

Long-Range $ZZ$ Interaction via Resonator-Induced Phase in Superconducting Qubits

Xiang Deng, Wen Zheng, Xudong Liao, Haoyu Zhou, Yangyang Ge, Jie Zhao, Dong Lan, Xinsheng Tan, Yu Zhang, Shaoxiong Li, Yang Yu

AI总结:

提出基于谐振器诱导相位门的三谐振器双微波多模耦合方案,实现亚米级长程高保真CZ门并降低残余光子,以增强量子比特连通性。

摘要:

超导量子计算正成为实现量子优越性的主要候选方案之一。然而,一个普遍挑战是由超导量子比特之间最近邻耦合所限制的有限量子连通性导致的编码开销。在此,我们基于谐振器诱导相位门,提出一种新型多模耦合方案,使用由两个微波驱动的三个谐振器,以扩展量子比特之间的 $ZZ$ 相互作用距离。我们证明,在自由光谱范围(FSR)为1.4 GHz时,可在160 ns内实现保真度超过99.9%的CZ门;并且通过优化驱动脉冲,在FSR为0.2 GHz时,我们进一步在100 ns内将残余光子降低至接近 $10^{-3}$。这些结果促成了跨越距离达到亚米量级的长程CZ门,从而显著增强量子比特连通性,并朝着量子处理器的可扩展集成与模块化迈出切实一步。具体而言,我们的方法支持实现需要高连通性的量子纠错码,例如低密度奇偶校验码,这为实现容错量子计算铺平了道路。

英文摘要:

Superconducting quantum computing emerges as one of leading candidates for achieving quantum advantage. However, a prevailing challenge is the coding overhead due to limited quantum connectivity, constrained by nearest-neighbor coupling among superconducting qubits. Here, we propose a novel multimode coupling scheme using three resonators driven by two microwaves, based on the resonator-induced phase gate, to extend the $ZZ$ interaction distance between qubits. We demonstrate a CZ gate fidelity exceeding 99.9\% within 160 ns at free spectral range (FSR) of 1.4 GHz, and by optimizing driving pulses, we further reduce the residual photon to nearly $10^{-3}$ within 100 ns at FSR of 0.2 GHz. These facilitate the long-range CZ gate over separations reaching sub-meters, thus significantly enhancing qubit connectivity and making a practical step towards the scalable integration and modularization of quantum processors. Specifically, our approach supports the implementation of quantum error correction codes requiring high connectivity, such as low-density parity check codes that paves the way to achieving fault-tolerant quantum computing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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