【时  间】2025年7月2日（星期三）10:00

【地  点】量子院526报告厅

【主  持】袁之良教授  光量子通信与器件团队

【报告人】Carlos Anton-Solanas, Universidad Autonoma de Madrid, Spain

【题  目】Quantum energetics & metrology with photon-number encoding

【摘 要】A two-level system (such as a charged semiconductor quantum dot), excited under a pulsed resonant drive of area , emits photon-number superposition states composed by vacuum and a single-photon in the form cos(θ/2)|0?+sin(θ/2)| 1? .^1,2 Additionally, a sequential two-pulse excitation can generate photon-number encoded time-entangled states of the form1/√2(|0_e 0_l ?+| 1_e 1_l ?) or 1/√2(| 1_e 0_l ?+| 0_e 1_l ?) , where the subindex e and l refer to early and late time-bins, respectively.^3,4 The expansion of this sequential excitation to a three-level system (such as one polarisation cascade of the biexciton-exciton decay) generates entanglement in time and energy,⁵ with prospects to allow secure quantum communication protocols.⁶

In this seminar, I will revisit these works and will discuss ongoing experiments on (1) the photon-number emission from the Ramsey sequence and its connection to quantum energetics, and (2) the constrained metrology performance of photon-number encoded Fibonacci states and alternatives to reach Heisenberg scaling in metrology protocols.⁷

【报告人简介】Carlos Antón-Solanas is a researcher specialised in experimental quantum optics and quantum materials. He finished his PhD in 2015, under the supervision of Prof. Vi?a, on III-V semiconductor exciton-polaritons. As a postdoc (IF Marie-Curie 2016-18), he was working in the group of Prof. Senellart between 2015-2019 on quantum optics with semiconductor QDs. Then, he moved to the group of Prof. Schneider, first in Würzburg (2020), and finally in Oldenburg, where he participated to the creation of the AG Quantenmaterialien. During this period, he worked on nonlinear & quantum photonics with different 2D materials. Since 2022, he leads the QOSS experimental team at the UAM.