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(Mar. 29) Rydberg electromagnetically induced transparency and microwave-to-optical conversion using Rydberg atoms

Last updated :2018-03-27

Topic: Rydberg electromagnetically induced transparency and microwave-to-optical conversion using Rydberg atoms
Speaker: Dr. Thibault Thomas Vogt
(Centre for Quantum Technologies; MajuLab)
Invited by: LIU Yang
Time: 9:30-10:30, Thursday, March 29, 2018
Venue: Room 107, Red House 17, Zhuhai Campus, SYSU

Abstract:
The applications of Rydberg atoms for quantum sensing, quantum simulation, and non-linear optics at the few-photons level, all rely on the extremely large transition dipole moments between Rydberg states, which enable strong long-range dipole-dipole interactions, as well as very large couplings to external fields. I will describe the diverse experiments performed in the Rydberg atom group at CQT, all of which making use of this particular property of Rydberg atoms.

In the first part of this talk, I will describe how we have recently demonstrated coherent microwave-to-optical conversion via frequency mixing in Rydberg atoms. In contrast to other physical systems being explored, our scheme requires no cavity and allows for free-space and broadband conversion due to the strong coupling of microwaves to Rydberg transitions. This result is promising for future quantum communication networks, as broadband interconversion of microwave and optical fields will be essential for connecting superconducting qubits and photonic qubits. I will discuss the recent strategies that we have developed for improving the efficiency of the conversion, which include the demonstration of three-photon electromagnetically induced transparency (EIT), and collinear frequency mixing.

In the second part of my talk, I will present our long-term goal of demonstrating spatially resolved imaging of Rydberg atoms, using Rydberg EIT in the presence of long-range dipole-dipole interactions. I will present diverse characterizations of the effect of interactions on Rydberg electromagnetically induced transparency, and show that Lévy statistics describes very well this many-body system.