Networks for quantum information

• Grant number: 22/08865-0
• Support Opportunities: Regular Research Grants
• Start date: December 01, 2022
• End date: December 31, 2024
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Marcelo Martinelli
• Grantee: Marcelo Martinelli
• Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated scholarship(s): 23/17599-4 - Development of light sources with negative Wigner functions for teleportation protocols, BP.TT; 23/00446-0 - Development of light sources with negative Wigner functions for teleportation protocols, BP.TT; 22/15414-4 - Development of non-Gaussian light sources for certification of teleportation protocols., BP.TT

Abstract

This proposal involves the fast investigation of the generation and the use of entangled states of light in quantum communication protocols. Our goal is the use of entanglement produced by an optical parametric oscillator as a resource for the teleportation of light states generated by atomic systems into the telecommunication L-band. At this wavelength, compatible with optical fibers, a non-local quantum network can be implemented, contributing to the concept of a ``quantum internet''. Another possibility is the transfer of the quantum states into photonic chips based on silicon and silicon nitride, that can be used as units for scalable information processing.The quantum states to be teleported will be generated by atomic systems by four wave mixing, generating entangled states, or by polarization elipse rotation, producing squeezed states. Starting from these Gaussian states, negative valued Wigner functions can be produced by photon subtraction. These non-Gaussian states are a fundamental resource for quantum information processing. (AU)