Measurement Quench in Many-Body Systems
Measurement Quench in Many-Body Systems
复制标题
多体系统的测量猝灭
DOI：
10.1103/physrevlett.121.030601
复制
发表时间：
2018-07-16
影响因子：
8.6
通讯作者：
Bose, Sougato
中科院分区：
文献类型：
--
作者：
Bayat, Abolfazl;Alkurtass, Bedoor;Bose, Sougato
测量是区分经典物理和量子物理的关键概念之一。与经典系统不同，对量子系统的测量通常会由于波函数坍缩而彻底改变它。在这里，我们建议可以利用这一特征来诱导多体系统中的淬火动力学，而保持其哈密顿量不变。重要的是，通过取消用于诱导淬灭的专用宏观设备，而只使用必不可少的测量设备，该协议有望更容易实施，更能抵御退相干。通过各种案例研究，我们表明我们的方案还具有决定性的优势，除了减少退相干-用于光谱学目的和探测临界和量子杂质多体系统的非平衡缩放。
Measurement is one of the key concepts which discriminates classical and quantum physics. Unlike classical systems, a measurement on a quantum system typically alters it drastically as a result of wave function collapse. Here we suggest that this feature can be exploited for inducing quench dynamics in a many-body system while leaving its Hamiltonian unchanged. Importantly, by doing away with dedicated macroscopic devices for inducing a quench-using instead the indispensable measurement apparatus only-the protocol is expected to be easier to implement and more resilient against decoherence. By way of various case studies, we show that our scheme also has decisive advantages beyond reducing decoherence-for spectroscopy purposes and probing nonequilibrium scaling of critical and quantum impurity many-body systems.