论文标题
通过定期推动交换互动来保护量子点旋转链中的量子信息
Protecting Quantum Information in Quantum Dot Spin Chains by Driving Exchange Interactions Periodically
论文作者
论文摘要
最近的工作证明了通过定期在栅极定义的量子点阵列中驾驶最近的邻居交换相互作用来证明在量子自旋链中离散时间晶体物理的新途径[ARXIV：2006.10913]。在这里，我们介绍了以较小的GAAS量子点（包括相图和其他诊断）的详细分析。我们还表明，新兴的时晶行为可以使多旋转状态的保护和操纵受益。对于GAAS中典型的核自旋噪声水平，驾驶和相互作用的组合可以保护旋转态状态，超出了没有交换相互作用的情况。我们进一步展示了如何在高保真度中的单线 - 三圈量子台之间构建一个时晶的cz门。这些结果表明，定期驱动交换耦合可以增强用于量子信息应用的量子点旋转系统的性能。
Recent work has demonstrated a new route to discrete time crystal physics in quantum spin chains by periodically driving nearest-neighbor exchange interactions in gate-defined quantum dot arrays [arXiv:2006.10913]. Here, we present a detailed analysis of exchange-driven Floquet physics in small arrays of GaAs quantum dots, including phase diagrams and additional diagnostics. We also show that emergent time-crystalline behavior can benefit the protection and manipulation of multi-spin states. For typical levels of nuclear spin noise in GaAs, the combination of driving and interactions protects spin-singlet states beyond what is possible in the absence of exchange interactions. We further show how to construct a time-crystal-inspired CZ gate between singlet-triplet qubits with high fidelity. These results show that periodically driving exchange couplings can enhance the performance of quantum dot spin systems for quantum information applications.
