Robust, bright photon sources for quantum communication and quantum sensing applications
ABSTRACT :
Photonic quantum sources are a primary ingredient for many quantum optical experiments. However, the realization of next-generation envisaged projects such as the ground-to-satellite and or inter-satellite links for the culmination of a worldwide quantum network and real-time quantum sensing demands the development of compact and robust photonic quantum sources with high brightness and entanglement purity. Over the years, we have progressed in developing the brightest entangled photon source with enhanced tolerance based on spontaneous parametric down-conversion in second-order nonlinear optical materials. In this talk, we will discuss some of our recent results on the progress of the bright, compact single photon and entangled photon source and its use in quantum sensing based on Hong-Ou-Mandel (HOM) interference for real-time displacement measurement in nanometre scale and quantum optical tomography for temperature-dependent refractive index variation. We will also discuss the demonstration of entangled photon-based free-space quantum key distribution over 300 meters in free-space and the communication of quantum-secure text, image transmission, and quantum-assisted two-way video calling between two parties in real time.
ABOUT THE SPEAKER:
Prof. Goutam K Samanta received his B. Tech and M.Tech in Optics and Optoelectronics from the University of Calcutta and Ph.D. in Photonics from the Institute of Photonics Sciences (ICFO), Barcelona, Spain, in 2009. He joined Physical Research Laboratory, Ahmedabad, in 2010. His research interest includes structured laser beams, nonlinear optics, optical parametric oscillators, quantum communication, and quantum sensing. He has more than 150 technic al contributions in peer-reviewed journals, conference proceedings, and a post-deadline papers. His recent results have been highlighted through the news release by OSA, and OPN, and featured along with cover page by APL Photonics. He is the recipient of the Gallieno Denardo Award of the International Commission of Optics and ICTP for his contribution to Optics and Photonics, 2017, and the best thesis award, Indian Laser Association, 2009. He has served as a technical committee member of different national and international conferences, an Editorial board member of the Journal of Optics, UK, guest editor of Journal of Optics and Journal of Physics B, a life member of the Indian Laser Association, and a senior member of the Optical Society of America. He also served as a guest lecturer at IIT Gandhinagar and Ahmedabad University. Besides his regular research activities, Prof. Samanta promotes Optics and Photonics among school and college students in different states in India thro ugh hands-on experiments. So far, their team has covered more than 50000 students in Gujarat, Rajasthan, Madhya Pradesh, and Maharashtra.
Affiliation of the Speaker :
Physical Research Laboratory, Ahmedabad