Danish National Research Foundation, Center for Quantum Optics - QUANTOP,
Department of Physics and Astronomy, The University of Aarhus,
Ny Munkegade 120, DK-8000 Aarhus, Denmark
Due to their excellent stability and controllable coherent coupling to the light fields, Coulomb crystals consisting of atomic ions represent an interesting media to investigate cavity Electromagnetically Induced Transparency (EIT) and related phenomena.
In the talk, I will report on the recent observation of cavity EIT with ion Coulomb crystals (40Ca+ ions) enclosed in a moderately high-finesse (¿~3000) linear cavity. EIT features with a width down to a few tens of kHz with nearly perfect transparency have been observed for weak probe fields at the single photon level.
Taking advantage of the favourable level structure of 40Ca+, a cavity EIT-based photon-blockade scheme, where an additional weak cavity field at 850 nm controls the transmission of a single probe photon at 866 nm, have additionally been investigated.
The obtained results are important first steps towards the realization of, e.g., high-efficiency quantum memories based on cavity EIT, single photon transistors and single-photon gates.