Information in quantum optics

• Grant number: 22/09436-5
• Support Opportunities: Research Projects - Thematic Grants
• Start date: April 01, 2023
• End date: March 31, 2028
• 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
• City of the host institution: São Paulo
• Principal investigators: Paulo Alberto Nussenzveig
• Associated researchers: Bárbara Lopes Amaral ; Luciano Soares da Cruz ; Nathália Beretta Tomazio ; Rafael Ferreira Pinto do Rego Barros
• Associated scholarship(s): 24/18055-0 - Development of non-Gaussian light sources for certification of teleportation protocols., BP.TT; 24/17009-5 - Multicolor teleportation of non-classical quantum states, BP.PD; 24/02882-5 - Entanglement among the transverse modes of an Optical Parametric Oscillator, BP.MS; + associated scholarships 24/09109-0 - Multicolor teleportation of non-classical quantum states, BP.DD; 23/07556-6 - Development of non-Gaussian light sources for certification of teleportation protocols, BP.TT; 23/04394-5 - State tomography with cavities, BP.IC; 23/04795-0 - Double pump laser source for atomic parametric amplifiers, BP.IC - associated scholarships

Abstract

After reaching 26 years of contributions in quantum optics and atomic physics, our group has gathered resources and expertise to follow the efforts in these research areas in their applications in quantum information and extreme measurements. Our present proposal will therefore stretch over different subjects in the field. We will investigate the creation of quantum entangled networks in continuous variables, using the parametric process of four wave mixing in atomic vapors, with applications in quantum computing using cluster states. Another subject will explore the ability to connect fields of distinct frequencies, separated by more than one octave, using teleportation protocols for non-classical states of the field (allowing the transfer of "qubits"). The goal here is to couple atomic lines to the telecommunication band in optical fibers by unconditional teleportation. We will investigate the behavior of parametric oscillators close to the oscillation threshold, exploring this phase transition by returning to the fundamentals of quantum optics to investigate the light produced in this condition. We will continue with the development of scalable sources of entangled states, using Si or Si$_3$N$_4$ microchips. We will begin the development of applications of X-ray photon correlation, aiming to use the high luminosity lines from the Sirius laboratory to implement high spatial resolution systems, with high energy photons, but in a minimum fluence regime to minimize damage to the samples under analysis. Finally, we will investigate the implementations of "bit commitment" proofs of principle, linking experiments to investigations of fundamental questions in quantum information. (AU)