Crossed optical-cavity system as a converter of coherent light into squeezed light

• Grant number: 23/09173-7
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: October 01, 2023
• End date: September 30, 2024
• Field of knowledge: Physical Sciences and Mathematics - Physics - General Physics
• Principal Investigator: Daniel Zini Rossatto
• Grantee: Aline Yoshimi Oi
• Host Institution: Instituto de Ciência e Engenharia. Universidade Estadual Paulista (UNESP). Campus Experimental de Itapeva. Itapeva , SP, Brazil

Abstract

Quantum light sources play a fundamental role in various domains of quantum information science. However, the efficient generation of multi-photon states is still a challenge to be overcome. In particular, the development of bi-photon state sources (such as two-photon laser/maser and squeezed light sources) has attracted considerable attention due to their applications in quantum information protocols, lithography, quantum metrology, as well as in medical and biological fields of interest. The present project aims to theoretically study the conversion of coherent light into squeezed light, as well as the conversion of a single-photon pulse into a two-photon pulse. For this purpose, the process of parametric down-conversion will be investigated in a cross-cavity system coupled to a two-level atom, where one cavity couples to the atom through conventional Jaynes-Cummings interaction, while the other does so through a two-photon Jaynes-Cummings interaction. To analyze the system, the input-output theory associated with the solution of the Schrödinger equation, neglecting occurrences of photon loss through atomic spontaneous emission, will be employed.