Institute: Indian Institute of Technology (IIT), Delhi

Principal Investigator: Dr. Joyee Ghosh

Co-Principal Investigator: Dr. Vivek Venkataraman

Photonic quantum technologies are interesting for applications in future quantum communication and information due to their speed, robustness and ease of implementation. Hence there is a lot of demand to develop efficient sources of entangled photons. Current approach to explore such technologies requires on-chip integration of photon sources with reconfigurable waveguide circuits. The proposed project on “Integrated sources of entangled photons for quantum communication and quantum information applications” aims to explore modern waveguide based sources with a strong Χ⁽²⁾ optical nonlinearitythat can work with fast optical modulators and have a compatibility for telecom optics.

With a two-fold interest, one part of the project will implement a narrow-band source of photon pairs based on type-II SPDC combined with fiber-optic based technologies at telecom wavelengths that can be applied to a QKD protocolor a Quantum Teleportation/Quantum Relay Protocol. The other part of the projectwill develop a broad-band, optical fiber-integrated WDM source of entangled photons/heralded single-photons using type-0 SPDC at telecom wavelengths that will simultaneously transmit data on several optical channels,thereby enhancing the effective data rate by a factor of the number of independent wavelength channels. This will be useful to enhance the number of users and information transfer/data rate for quantum communication networks. And in particular, this could be applied to a multiuser QKD protocol over the broad telecom band.

Publications from this project: