Exploring quantum information with atoms, crystals and chips

• Grant number: 15/18834-0
• Support type: Research Projects - Thematic Grants
• Duration: February 01, 2016 - January 31, 2021
• Field of knowledge: Physical Sciences and Mathematics - Physics
• Principal Investigator: Marcelo Martinelli
• Grantee: Marcelo Martinelli
• Home Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Co-Principal Investigators: Paulo Alberto Nussenzveig
• Associated grant(s): 16/50468-7 - Nanophotonics for quantum computing and precision measurements, AP.R
• Associated scholarship(s): 18/03155-9 - Implementing four wave mixing technology for entanglement networks, magnetometry and to explore quantum thermodynamics, BP.PD; 17/27096-9 - Using teleportation to convert quantum states of the field into the telecom C-band, BP.MS; 17/27216-4 - Studying the quantum state of the field at the threshold of the optical parametric oscillator, BP.DR; 16/04110-3 - Producing entanglement between atoms and microcavities, BP.IC; 14/27223-2 - Control of quantum information with continuous variables of light beams, BP.PD

Abstract

Studies in quantum information using discrete or continuous variables of the electromagnetic field imply in the productions and control of quantum states of light, as well as the storage of these states in matter, eventually allowing the process of information using the principles of quantum mechanics. The final goal is achieving superior information processing capacity, solving problems deemed as unsolvable by classical information processing. We propose the continuity of our current work involving generation of tunable entangled light at different ranges of the electromagnetic field using optical parametric oscillators based on crystals, and its application in interfaces between atoms and silicon (Si) or silicon nitride (SiN) chips). Atomic media allow the information storage, while new techniques involving integrated optical parametric oscillators allow the scalability of quantum systems, thanks to the lithographic techniques common in electronics industry. We are aiming, finally, at the integration of different functions for quantum logical operations in a scalable manner. We may count on our current experience in generation of entangled states and control of atomic media. We are expanding our facilities focusing on testing the silicon chips produced in cooperation with M. Lipson and A. Gaeta (U. Cornell), while we study new light sources based on four wave mixing processes in atoms (A. Marino, U. Oklahoma), and the analysis of cluster states (N. Treps - LKB/ENS, and O. Pfister - U. Virginia). (AU)