報告(gao)時間：2025年5月12日下(xia)午15：00 (15:00, May.12, 2025)
報告地(di)點：物質科研樓A309會議室(Room A309, Material Science Building)
報告(gao)人: Prof. Gonzalo A. Alvarez
報告題目/Title: Quantum sensing tools for out-of-equilibrium systems with magnetic resonance
摘(zhai)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. St?hr, A. Denisenko, A. Zwick, G.A. álvarez, A. Finkler. arXiv:2501.05814
報(bao)告人簡介/Curriculum Vitae:
Prof. Gonzalo A. Alvarez，任(ren)職(zhi)于阿根廷核(he)能委(wei)員(yuan)會（CNEA）巴(ba)里(li)洛切原(yuan)子能(neng)中心與庫約(yue)國立大(da)學巴(ba)爾塞羅研(yan)究所(suo)。在基礎物(wu)理與應用技術的交(jiao)叉領域追求創新研究。已在高影響力國際期刊上發表了(le)60多(duo)篇(pian)論文(wen)（包括5篇綜(zong)述文章），其中包括對《科學(xue)》、《自然-通訊(xun)》、《現代物理(li)評論》、《物理(li)評論快(kuai)報》、《PRX Quantum》、《美國科學院院刊》、《科學報告(gao)》、《物理評論(lun)應用》等期刊的重(zhong)要(yao)貢獻(xian)。研究獲得了3500多(duo)次引(yin)用，h指數為30，反映了其影(ying)響力和(he)對該領(ling)域的相關性。工作主要側重于開發(fa)量子控制方(fang)法(fa)，該方(fang)法(fa)利(li)用量子信息和(he)傳感的基本原理來推動NMR成像和光譜學應用的發展。
