利用Floquet哈密顿量与弱测量实现多体纠缠的自主稳定化
Autonomous stabilization of many-body entanglement with Floquet Hamiltonians and weak measurement
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中文总结 AI 辅助
提出将Floquet哈密顿量工程与弱测量结合，实现多体纠缠的自主稳定化，在半导体量子点中构建自旋压缩态和薛定谔猫态，可抵抗现实退相干。
中文摘要 AI 辅助
利用大型量子系统实现技术优势需要保护其多体纠缠。耗散通常通过随机投影噪声使量子系统退相干，但当其与相干相互作用巧妙结合时，可以将系统引导至目标纠缠态。然而，大多数系统可用的本征相互作用和耗散通道难以有效组合。在此，我们提出将Floquet哈密顿量工程（可构建非本征相干相互作用）与弱测量（可提供可调耗散通道）交错结合，以实现多体纠缠的可编程且自主的稳定化。我们针对半导体量子点的中心自旋系统进行了解析和数值证明，为此我们构建了自旋压缩态和薛定谔猫态，这些态在现实水平的退相干下得以稳定。我们的方法适用于任何兼容周期性驱动和可调测量强度的系统，并可能为实用化纠错提供新途径。
英文摘要
Reaching a technological advantage with large quantum systems requires safeguarding their many-body entanglement. Dissipation typically acts to decohere a quantum system via random projective noise but, when judiciously engineered together with coherent interactions, it can funnel the system towards a target entangled state. The native interactions and dissipative channels available to most systems are, however, difficult to combine effectively. Here we propose interleaving Floquet Hamiltonian engineering, which allows the construction of non-native coherent interactions, with weak measurement, which enables a tuneable dissipative channel, to enable programmable and autonomous stabilization of many-body entanglement. We show this analytically and numerically for the central-spin system of a semiconductor quantum dot, for which we construct spin-squeezed and Schrödinger-cat states that are stabilized against realistic levels of dephasing. Our approach is applicable to any system compatible with periodic drives and tuneable measurement strength and could enable novel approaches to practical error correction.
发表机构
- Cavendish Laboratory, University of Cambridge（剑桥大学卡文迪许实验室）
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