报告时间：2025年5月12日下午15：00 (15:00, may.12, 2025)
报告地点：物质科研楼a309会议室(room a309, material science building)
报告人: prof. gonzalo a. alvarez
报告题目/title: quantum sensing tools for out-of-equilibrium systems with magnetic resonance
摘要/abstract:
reliable processing of quantum information is crucial for the development of quantum technologies. characterizing out-of-equilibrium quantum systems [1–3], which are ubiquitous at quantum scales, is essential for designing optimal control and quantum sensing strategies. however, this task is highly challenging due to the complex high-order correlations and non-stationary nature of such systems. in this talk, i will present a series of methods to characterize the decoherence of out-of-equilibrium quantum systems [1,4–8]. using quantum simulations with solid-state nuclear magnetic resonance (nmr), we quantify out-of-time-order correlations (otocs [2–3]) to define a critical threshold for disturbances that enables reliable control of large quantum systems [1,4–5]. furthermore, we develop a framework for quantum sensing the dynamics of out-of-equilibrium systems exhibiting non-stationary and non-markovian features, as well as time-reversal symmetry breaking in quantum dynamics [6-8]. we exploit these insights to introduce a quantum sensing paradigm that quantifies how far the sensed environment is from equilibrium or how intrinsically quantum non-gaussian it is, a characteristic of strongly coupled environments [7,8]. this approach allows us to discern and filter various environmental properties, including stationary, non-stationary, and non-gaussian quantum noise fluctuations, advancing toward sensing the ubiquitous environments of quantum sensors at atomic and nanoscales.
[1] g. a. alvarez, d. suter, r. kaiser. science 349, 846 (2015).
[2] r.j. lewis-swan, a. safavi-naini, a.m. kaufman, a.m. rey. nat. rev. phys. 1, 627 (2019).
[3] b. swingle. nat. phys. 14, 988 (2018).
[4] f.d. dominguez, m.c. rodriguez, r. kaiser, d. suter, g.a. alvarez. phys. rev. a 104, 012402 (2021).
[5] f.d. dominguez, g.a. alvarez. phys. rev. a 104, 062406 (2021).
[6] m. kuffer, a. zwick, g.a. alvarez. prx quantum 3, 020321 (2022).
[7] m. kuffer, a. zwick and g.a. alvarez. prx quantum 6, 020320 (2025)
[8] j.w. rosenberg, m. kuffer, i. zohar, r. stöhr, a. denisenko, a. zwick, g.a. álvarez, a. finkler. arxiv:2501.05814
报告人简介/curriculum vitae:
prof. gonzalo a. alvarez，任职于阿根廷核能委员会（cnea）巴里洛切原子能中心与库约国立大学巴尔塞罗研究所。在基础物理与应用技术的交叉领域追求创新研究。已在高影响力国际期刊上发表了60多篇论文（包括5篇综述文章），其中包括对《科学》、《自然-通讯》、《现代物理评论》、《物理评论快报》、《prx quantum》、《美国科学院院刊》、《科学报告》、《物理评论应用》等期刊的重要贡献。研究获得了3500多次引用，h指数为30，反映了其影响力和对该领域的相关性。工作主要侧重于开发量子控制方法，该方法利用量子信息和传感的基本原理来推动nmr成像和光谱学应用的发展。
