We present here a quantum tripwire, which is a quantum optical interrogation technique capable of detecting an intrusion with very low probability of the tripwire being revealed to the intruder. Our scheme combines interaction-free measurement with the quantum Zeno effect in order to interrogate the presence of the intruder without interaction. The tripwire exploits a curious nonlinear behaviour of the quantum Zeno effect we discovered, which occurs in a lossy system. We also employ a statistical hypothesis testing protocol, allowing us to calculate a confidence level of interaction-free measurement after a given number of trials. As a result, our quantum intruder alert system is robust against photon loss and dephasing under realistic atmospheric conditions and its design minimizes the probabilities of false positives and false negatives as well as the probability of becoming visible to the intruder.
What Output-Equivalence Oracles Miss: An Empirical Study of Equivalence-Invisible Bug Fixes in Quantum Transpilers
City University of Science and Information Technology (CUSIT)（城市科学与技术大学）；National University of Computer and Emerging Sciences (FAST-NUCES)（国立计算机与新兴科学大学）
Fault-Class-Matched Test Oracles for Output-Invisible Quantum Transpiler Regressions
City University of Science and Information Technology (CUSIT)（城市科学与技术大学）；National University of Computer and Emerging Sciences (FAST-NUCES)（国家计算机与新兴科学大学）
On the Entanglement Entropy Distribution of a Hybrid Quantum Circuit
NextQuantum Innovation Research Center, Department of Physics and Astronomy, Seoul National University（首尔大学物理与天文学系量子创新研究中心）；School of Computational Sciences, Korea Institute for Advanced Study（韩国高等科学研究院计算科学学院）；Department of Physics and Astronomy, Seoul National University（首尔大学物理与天文学系）
Quantum Barankin bounds beyond local unbiasedness: Analytic results for Gaussian states via a right-division framework
University of the Basque Country UPV/EHU（巴斯克大学）；EHU Quantum Center, University of the Basque Country UPV/EHU（巴斯克大学量子中心）；School of Mathematical Sciences and Centre for the Mathematics and Theoretical Physics of Quantum Non-Equilibrium Systems, University of Nottingham（诺丁汉大学数学科学与量子非平衡系统数学与理论物理中心）；Instituto de Física Corpuscular (IFIC), CSIC-Universitat de València and Departament de Física Teòrica, UV（粒子物理研究所（IFIC），瓦伦西亚大学-CSIC及理论物理系，UV）；Basque Center for Applied Mathematics (BCAM)（巴斯克应用数学中心）
在量子Zeno效应中，量子测量可以通过将二能级系统的态冻结在一个测量本征态上来阻断系统的相干振荡。该效应通常由测量频率控制。在这里，我们研究的芝诺制度的发展作为一个连续的部分测量的测量强度的函数。我们发现，芝诺制度的发病标志着一个$\textit{cascade of transitions}$在系统动力学的测量强度的增加。其中一些跃迁只在单个量子轨道的集体行为中才明显，而在平均动力学中是不可见的。它们包括出现一个区域的动态无法访问的国家和奇异的稳态概率分布的国家。这些新预测的动力学特征，可以很容易地在当前的实验中观察到，显示了根本不可预测的量子跳跃与最近实验中持续监测和恢复的量子跳跃共存。
Coherence-induced deep thermalization transition in random permutation quantum dynamics
National University of Singapore（新加坡国立大学）；The University of Texas at Austin（德克萨斯大学奥斯汀分校）；Centre for Quantum Technologies, National University of Singapore（新加坡国立大学量子技术中心）
