Seif Alireza, Wang Yu-Xin, Movassagh Ramis, Clerk Aashish A
Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, USA.
<a href="https://ror.org/02048n894">Joint Center for Quantum Information and Computer Science</a>, University of Maryland, College Park, Maryland 20742, USA.
Phys Rev Lett. 2024 Aug 2;133(5):050402. doi: 10.1103/PhysRevLett.133.050402.
We study the interplay between measurement-induced dynamics and conditional unitary evolution in quantum systems. We numerically and analytically investigate commuting random measurement and feed forward (MFF) processes and find a sharp transition in their ability to generate entanglement negativity as the number of MFF channels varies. We also establish a direct connection between these findings and transitions induced by random dephasing from an environment with broken time-reversal symmetry. In one variant of the problem, we employ free probability theory to rigorously prove the transition's existence. Furthermore, these MFF processes have dynamic circuit representations that can be experimentally explored on current quantum computing platforms.
我们研究了量子系统中测量诱导动力学与条件幺正演化之间的相互作用。我们通过数值和解析方法研究了对易随机测量和前馈（MFF）过程，并发现随着MFF通道数量的变化，它们产生纠缠负性的能力存在明显转变。我们还在这些发现与由具有破缺时间反演对称性的环境中的随机退相诱导的转变之间建立了直接联系。在该问题的一个变体中，我们运用自由概率论严格证明了转变的存在。此外，这些MFF过程具有动态电路表示形式，可在当前的量子计算平台上进行实验探索。
