时间：9月4日（周四）上午10：30

地点：勤园20-518

报告简介：

Building a practical quantum radar is a major challenge. This is because the atmosphere creates a high level of microwave noise, with a background noise level of approximately = 3000. We show that the signal-to-noise ratio (SNR) for correlations between the idler and the received signal can be improved. This is done by two-mode squeezing a noisy state [1] instead of a vacuum state. The existing initial noise actually helps to overcome the noise in the channel.

For example, a target with very low reflectivities of η=10⁻⁷ and η=10⁻⁹ can be detected using only M=30 and M=250 copies, respectively. These numbers are remarkable, as most existing literature requires η=10⁻² and M=10,000 copies. This method can also be used to transfer classical information through nanowires by encoding data in the degree of squeezing [2].

At the end of the talk, I will also mention recent advances in the electrical control of optical properties. This includes the continuous control of nonlinearity [3], emission lifetime [4], and extraordinary optical transmission [5]. These are all key elements for developing integrated quantum circuits.

[1] M. Gundogan and M. Emre Tasgin, //arxiv.org/abs/2503.08248 (for an unrevised version)

[2] 1. Mehmet Emre Tasgin, Encoding classical data into the squeezing of noisy-states for nanowire communication, arXiv:2505.04516

[3] Mehmet Günay, Priyam Das, Emre Yüce, Emre Ozan Polat, Alpan Bek and Mehmet Emre Tasgin, On-demand continuous-variable quantum entanglement source for integrated circuits, Nanophotonics 12, 229-237 (2023).

[4] Emre Ozan Polat, Zafer Artvin, Yusuf Şaki, Alpan Bek, Ramazan Sahin, Continuous and Reversible Electrical Tuning of Fluorescent Decay Rate via Fano Resonance, arXiv:2412.20199

[5] Hira Asif, Alpan Bek, Mehmet Emre Tasgin and Ramazan Sahin, Voltage-control of extraordinary optical transmission in the visible regime, Phys. Rev. B 109, 125425 (2024). arXiv:2311.02949

报告人简介：

土耳其量子光学专家Mehmet Emre Tasgin教授，现任Hacettepe大学全职教授。2009年获比尔肯特大学物理学博士，研究方向为量子纠缠、超辐射BEC与等离激元纳米结构等，主持科研项目10余项，发表PR系列、Nanophotonics等高水平论文50余篇，任土耳其量子光学学会创会会员，曾获土耳其科学院杰出青年科学家奖。