She was an undergraduate student at the National Technical University of Athens, where she majored in electrical and computer engineering.

[1] She moved to the United States for graduate studies, joining Stanford University as a Master's student.

She remained at Stanford for her doctoral research, where she looked at the implementation of phase shift quantum key distribution systems.

[2] After graduating, Diamanti returned to Europe, where she joined Institut d'Optique as a Marie Skłodowska-Curie Actions Fellow.

Diamanti was appointed to the faculty at the French National Centre for Scientific Research (CNRS) in 2009.