连续监测无相互作用费米子系统中扩散轨迹的Unraveling诱导纠缠相变
Unraveling-induced entanglement phase transition in diffusive trajectories of continuously monitored noninteracting fermionic systems
AI总结：
本文提出在固定测量率下改变测量过程本身可引发纠缠相变，通过数值模拟无相互作用费米子系统的扩散检测过程，发现调节unraveling参数可使系统从面积律纠缠转变为对数标度纠缠，为定制量子关联和优化经典模拟提供参考。
摘要：
幺正量子动力学与由连续监测过程产生的耗散随机效应之间的竞争，最终可导致测量诱导的相变。在此，当超过临界测量率时，多体系统会从高度纠缠的相态突变至低纠缠相态。我们考虑了纠缠相变的不同视角，并探索在保持测量率固定的情况下，当测量过程本身被改变时是否会出现这些相变。为了说明这一想法，我们考虑了一个无相互作用费米子系统，并聚焦于扩散检测过程。通过广泛的数值模拟，我们表明，在改变一个合适的unraveling参数（在不同正交算符的测量之间进行插值）时，系统会从具有面积律纠缠的相态转变为纠缠随系统大小呈对数标度的相态。我们的发现可能有助于在噪声量子设备中定制量子关联，并为构思最优的经典模拟策略提供参考。
英文摘要：
The competition between unitary quantum dynamics and dissipative stochastic effects, as emerging from continuous-monitoring processes, can culminate in measurement-induced phase transitions. Here, a many-body system abruptly passes, when exceeding a critical measurement rate, from a highly entangled phase to a low-entanglement one. We consider a different perspective on entanglement phase transitions and explore whether these can emerge when the measurement process itself is modified, while keeping the measurement rate fixed. To illustrate this idea, we consider a noninteracting fermionic system and focus on diffusive detection processes. Through extensive numerical simulations, we show that, upon varying a suitable \textit{unraveling parameter} -- interpolating between measurements of different quadrature operators -- the system displays a transition from a phase with area-law entanglement to one where entanglement scales logarithmically with the system size. Our findings may be relevant for tailoring quantum correlations in noisy quantum devices and for conceiving optimal classical simulation strategies.
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