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State tomography with cavities

Grant number: 23/04394-5
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): May 01, 2023
Effective date (End): April 30, 2024
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Marcelo Martinelli
Grantee:Marcelo Marcelino de Carvalho
Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:22/09436-5 - Information in quantum optics, AP.TEM


The capacity of transferring the information of a quantum state between two distinct sites without transporting the system itself defines the idea of teleportation, a resource that overcomes the limitation of reading and writing a quantum state, given by the no-cloning theorem. This process relies on the shared information of an entangled pair between two remote stations to perform the transfer protocol.We developed a technique for the transferring of quantum information of a light field between distinct ranges of the electromagnetic spectra. With this technique, we can overcome losses in transmission, using the clear bandwidth of the L-telecom band to transfer information generated by an atomic ensemble (in this case, from the D1 line of $^{87}Rb$ atoms.The current project is inserted in this proposal as the development of the technique for measuring a Gaussian state associate to an intense beam and recover the information through self-homodyne technique.

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