Absolutely Stable Spatiotemporal Order in Noisy Quantum Systems

通过含噪量子信道发送绝对最大纠缠态

Sending absolutely maximally entangled states through noisy quantum channels

本文研究量子比特绝对最大纠缠态在含噪信道下的行为，发现去极化信道下纠缠性质保持不变，而退相干信道下则出现依赖态和比特选择的对称性破缺，揭示了 AME 态对噪声的鲁棒性差异。

Characterizing the boundary of the set of absolutely separable states and their generation via noisy environments

We characterize the boundary of the convex compact set of absolutely separable states, referred as {\bf AS}, that cannot be transformed to entangled states by global unitary operators, in $2\otimes d$ Hilbert space. However, we show that the absolutely separable states of rank-$(2d-1)$ are extreme points of such sets. We then discuss conditions to examine if a given full-rank absolutely separable state is an interior point or a boundary point of {\bf AS}. Moreover, we construct two-qubit absolutely separable states which are boundary points but not extreme points of {\bf AS} and prove the exis…

与基无关的稳定性与最大噪声魔态

Basis-independent stabilizerness and maximally noisy magic states

本文研究了绝对稳定子态和绝对威金纳正态态的特征，揭示了非稳定子态和威金纳负态的纯度下限，并提出了基于纯度的必要条件。

Simulating hydrodynamics on noisy intermediate-scale quantum devices with random circuits

In a recent milestone experiment, Google's processor Sycamore heralded the era of "quantum supremacy" by sampling from the output of (pseudo-)random circuits. We show that such random circuits provide tailor-made building blocks for simulating quantum many-body systems on noisy intermediate-scale quantum (NISQ) devices. Specifically, we propose an algorithm consisting of a random circuit followed by a trotterized Hamiltonian time evolution to study hydrodynamics and to extract transport coefficients in the linear response regime. We numerically demonstrate the algorithm by simulating the build…

前向辅助纯化：超越传统极限的时空框架

Forward-Assisted Purification: A Spatiotemporal Framework Beyond Conventional Limits

提出一种将纯化视为动态任务的时空框架，通过跨噪声过程分布干预，实现单拷贝协议超越传统50拷贝的性能，并规避传统纯化不可行定理。

通过量子-经典反馈延长离散时间晶体

Prolonging a discrete time crystal by quantum-classical feedback

本文提出一种利用量子-经典反馈协议的时间周期性方案，在NISQ设备上显著延长离散时间晶体的存活时间，突破退相干限制，为模拟复杂量子多体动力学提供新路径。