Temperature-Controlled Entangled-Photon Absorption Spectroscopy

Roberto Leon
June 12th, 2019 Roberto de J. León-Montiel National Autonomous University of Mexico (UNAM)

Entangled two-photon absorption spectroscopy has been widely recognized as a powerful tool for revealing relevant information about the structure of complex molecular systems. However, to date, experimental implementation of this technique has remained elusive, mainly because of the need to perform multiple experiments with two-photon states differing in temporal correlations, which translates in the necessity to have at the experimenter’s disposal tens, if not hundreds, of entangled-photon sources. In this talk, I will describe an experimentally-feasible scheme, developed in my group, which successfully overcomes this limitation. By making use of a temperature-controlled entangled-photon source, I will show that the two-photon absorption signal, recorded as a function of the temperature of the nonlinear crystal that generates the paired photons, and a controllable delay between them, carries all information about the electronic structure of the absorbing medium, which can be revealed by a simple Fourier transformation.

Dr. Roberto León-Montiel is a former PhD student from the research group led by Prof. Juan P. Torres at ICFO. In 2015, he joined the Department of Chemistry and Biochemistry at University of California, San Diego as a UC-MEXUS Postdoctoral Fellow, winning the UC-MEXUS Monarch Award for the most outstanding research proposal submitted to the UC MEXUS-CONACYT Postdoctoral Fellowship competition. In 2016, Dr. León-Montiel joined the faculty of the Institute of Nuclear Sciences at the National Autonomous University of Mexico (UNAM) as an Assistant Professor. He is currently the Chair of the Optical Society of America (OSA) Quantum Computing and Communication Technical Group, and his work is focused on the development of novel spectroscopy techniques using non-classical light, as well as design and fabrication of quantum-processor emulators.

ICFO Alumni Seminar, June 12, 2019, 17:00. ICFO’s Seminar Room