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Proposal to generate and characterize entanglement using metamaterials resonators

Grant number: 19/22038-6
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): January 01, 2020
Effective date (End): July 31, 2023
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Francisco Paulo Marques Rouxinol
Grantee:Alessandro Silva Santana
Home Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated research grant:17/08602-0 - Development of quantum superconducting devices to observe quantum states of motion with an hybrid quantum electromechanical system, AP.JP


Entanglement is the main resource needed for the development of many quantum technologies and quantum devices. Up to date, many proposals for entanglement generation have been experimentally realized. However, multipartite entanglement generation is still a challenge due to the difficulties of working with larger systems. In this project, we will begin experiments to generate and characterize, for the first time, a multipartite entangled state using recent proposals to using a hybrid superconducting metamaterial transmission line for circuit QED. The setup proposed allows the ultrastrong coupling of a qubit and a mechanical resonator to many modes of a composite transmission line which can be used to realize a robust multipartite entanglement generation. For this project, we will develop and fabricate the required micro and nanodevices, which will be embedded on a chip. To achieve the required low-temperatures for superconductivity, a dilution refrigerator will be used allowing us to achieve sub50mK temperatures. Finally, measurements on the system will be realized using circuitry for low-noise measurements both at low-frequency (DC-MHz) and in the RF/Microwave regime (up to 20GHz) which will then be characterized and compared to numerical simulations. The entanglement characterization will be done using an entanglement witness or quantum state tomography. The experimental realization of such a system will open up many possibilities in the future, for example, environmental engineering and the study of strong regime spin-bosons models. (AU)