标题： 在非厄米超导量子比特中加速多体纠缠生成 显示英文标题

标题： Accelerating multipartite entanglement generation in non-Hermitian superconducting qubits

摘要： 开放量子系统由于其周围环境的影响，容易出现信息、能量和粒子的损失。 一种创新的策略是通过定制的非厄米量子系统，将这些损失转化为量子技术的优势。 在本工作中，我们理论提出了一种在非厄米量子比特中快速生成多体纠缠的方法。 我们的研究结果表明，与厄米量子比特相比，弱耦合的非厄米量子比特在接近$2^n$阶异常点时，可以将多体纠缠生成速度提高数千倍，特别是在$n$量子比特的${\cal P}{\cal T}-$对称区域。 此外，我们展示了厄米量子比特可以在与非厄米量子比特相当的时间尺度内以高于$0.9995$的保真度生成GHZ态，但需要付出强烈的驱动和大的耦合常数的代价。 我们的方法可扩展到大量量子比特，为通过多体量子系统中的非厄米性和高阶异常点推动量子技术发展提供了一条有前景的途径。 显示英文摘要

摘要： Open quantum systems are susceptible to losses in information, energy, and particles due to their surrounding environment. One novel strategy to mitigate these losses is to transform them into advantages for quantum technologies through tailored non-Hermitian quantum systems. In this work, we theoretically propose a fast generation of multipartite entanglement in non-Hermitian qubits. Our findings reveal that weakly coupled non-Hermitian qubits can accelerate multiparty entanglement generation by thousands of times compared to Hermitian qubits, in particular when approaching the $2^n$-th order exceptional points of $n$ qubits in the ${\cal P}{\cal T}-$ symmetric regime. Furthermore, we show that Hermitian qubits can generate GHZ states with a high fidelity more than $0.9995$ in a timescale comparable to that of non-Hermitian qubits, but at the expense of intense driving and large coupling constant. Our approach is scalable to a large number of qubits, presenting a promising pathway for advancing quantum technologies through the non-Hermiticity and higher-order exceptional points in many-body quantum systems.