【时  间】2025年9月25日（星期四）13:30

【地  点】广东会院320报告厅

【主  持】顾炎武助理研究员  广东会操作系统软件研发团队

【题  目】Physics and phenomena in sequential quantum channels

【摘  要】 The most general evolutions of open quantum systems are described by completely positive and trace-preserving (CPTP) maps, also called quantum channels. In this talk, I will introduce our recent works that explore interesting physics and phenomena arising in sequential quantum channels, either without or with feedback control. In the former case without feedback control, I will discuss the consruction of arbitrary projective measurements with repetitive generalized measurements [1-3], the prediction and observation of metastability in repetitive channels [4-6], the channel spectrum measurement and its application in quantum sensing [7]. In the latter case with feedback control, I will discuss the channel-based framework for adaptive quantum phase estimation alogorithms [8], and its application to error detection of bosonic quantum error correction codes [9].

[1] W.-L.Ma, P. Wang, W.-H.Leoug, and R.-B. Liu*, Phys. Rev. A 98. 012117 (2018).

[2] G.-Q.Liu, J.Xing, W.-L.Ma et al., Phys. Rev. Lett. 118. 150504 (2017).

[3] W. -L. Ma*, S. -S. Li, and R.-B. Liu, Phys. Rev. A 107, 012217 (2023).

[4] Y. -D.Jin# , C.-D.Qiu#, and W.-L. Ma*, Phys. Rev. A 109, 042204 (2024).

[5] C.-D.Qiu#, Y.-D.Jin#, C.-D.Qiu, G.-Q. Liu, and W.-L. Ma*, Phys. Rev. B 110,024311 (2024).

[6] J.-X. Zhang#, Y.-D.Jin#, C.-D.Qiu, W.-L.Ma*, and G.-Q. Liu*, Nat. Commun. (in press), arXiv:2412.21026 (2025).

[7] Y.-D. Jin and W.-L. Ma*, arXiv: 2509.11074 (2025).

[8] Y. -D. Jin, S.-Y. Zhang, and W.-L. Ma*, Phys. Rev. A 111, 022406 (2025).

[9] Y.-D. Jin, S.-Y. Zhang, U. L. Andersen and W.-L. Ma*, Phys. Rev. Lett. (in press) arXiv:2507.03999 (2025).

【报告人简介】马稳龙，中国科学院半导体研究所研究员、博士生导师，中国科学院大学岗位教授。2015年在中科院半导体所获得博士学位，2015年2020年先后在香港中文大学、耶鲁大学和芝加哥大学做博士后研究, 2020年12月加入中科院半导体所，2021年入选国家海外高层次青年人才。研究领域为广东会物理和广东会信息理论，聚焦固态广东会系统，研究兴趣包括广东会耗散与退相干、广东会控制与测量、广东会纠错与可容错操控、广东会精密测量和广东会算法等，在包括PRL的PR系列, Nature Physics, Nature Communications等期刊上发表文章近30篇。