DQC Seminar Series: Photonic quantum sensing using entangled photons

ABSTRACT: Photonic quantum sensing is attracting significant attention because it enables capabilities that surpass the fundamental limits of classical optical sensing by leveraging non-classical states of light, such as entangled photon pairs, which cannot be fully described by Maxwell's equations. In this talk, we focus on quantum infrared spectroscopy (QIRS) based on strongly frequency‑nondegenerate entangled photon pairs. QIRS is attracting considerable attention because infrared spectroscopy can be performed using visible-light sources and detectors. We present demonstrations of ultra-broadband QIRS using chirped quasi-phase-matched devices [1] and pulse-excited quantum Fourier-transform infrared (QFTIR) [2], which maintain high spectral resolution, contrary to earlier expectations. We will briefly introduce our efforts toward social implementation at Kyoto University. These works were supported in part by MEXT Q-LEAP (JPMXS0118067634), JST ERATO (TAKEUCHI Super Quantum Entanglement (JPMJER2402)), and Grant-in-Aid from JSPS no. 24H00195. --- BIO: After receiving his Master's degree in Physics from Kyoto University in 1993, he joined Mitsubishi Electric Corporation as a researcher. In 1999, he moved to Hokkaido University as a Lecturer, later serving as an Associate Professor (2000) and then a Professor (2007) at the Research Institute for Electronic Science. He was a visiting scholar at Stanford University (1997-1998) and served as an invited Professor at Osaka University with his entire research group from 2008 to 2014. Since 2014, he has been a Professor at Kyoto University. He earned his Ph.D. from Kyoto University in 2000. He has received numerous awards, including the Scientific American 50 award in 2007, the JSPS Prize in 2010, and most recently, the 2026 Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology (Research Category). --- Upcoming seminar 21 May: Florian Ungerechts