单个自旋切换开放量子系统的稳态相位
A Single Spin Switches the Steady-State Phase of an Open Quantum System
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中文总结 AI 辅助
该研究发现临界耗散失衡下，单自旋可切换耗散集体自旋稳态相位，利用宇称决定Dicke梯对非线性损耗零点的采样，产生奇数N序列特有的一阶耗散相变，为单组元调控稳态相位提供新途径。
中文摘要 AI 辅助
对于多体系统，通常认为仅改变一个组元只会对强度型可观测量产生可忽略的修正。本文表明，在临界耗散失衡之上，在固定强度控制下添加一个自旋，可使耗散集体自旋的稳态在相位平均环与南极不动点之间切换。与此前通过暗态干涉实现的单自旋传感不同，此处宇称决定了Dicke梯是否采样依赖于态的非线性损耗振幅的零点：整数自旋梯采样该零点，使m<0的Dicke态为瞬态；半整数自旋梯则错过该零点，保持单一循环类。精确有限尺寸稳态显示，定态权重间的指数竞争放大了这种微观连通性差异，产生仅局限于奇数N序列的一阶耗散相变。保留所有布居自旋扇区的单自旋加载证实，罕见量子涨落会引发该切换而无需后选择。本文结果确立了跃变算符零点作为单组元控制稳态相位的途径。
英文摘要
Changing a many-body system by one constituent is normally expected to produce only a vanishing correction to an intensive observable. Here we show that, above a critical dissipation imbalance, adding or removing one spin at fixed intensive controls switches the steady state of a dissipative collective spin between a phase-averaged ring and a south-polar fixed point. Unlike previous one-spin sensing through dark-state interference, parity here determines whether the Dicke ladder samples an interior zero of the nonlinear jump amplitude. The integer-spin ladder samples this zero, making Dicke states with m<0 transient, whereas the half-integer ladder misses it and remains a single recurrent class. Exact finite-size steady states show that exponential competition between stationary weights amplifies this microscopic connectivity difference, yielding a first-order dissipative phase transition confined to the odd-N sequence. Multisector one-spin loading and state-unresolved removal confirm the switch, while the exponentially increasing switching time reflects the metastable isolation of the competing macroscopic basins. Our results establish representation-lattice sampling as a route to phase control, suggesting parity-based detection of single-spin addition or removal.
发表机构
- College of Engineering Physics, Shenzhen Technology University（深圳技术大学工程物理学院）
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