Barium Ion - Cavity Quantum Electrodynamics

We trap a singly charged Barium ion inside a high-finesse optical resonator. The strong coupling provided by the optical resonator, also known as cavity, enables the controlled state mapping of a photon on to the atomic state. We study the behaviour of this coupled atom-photon system and explore new routes for using the cavity to cool the ion and to create a versatile atom-photon interface for quantum information.

Ion in high finesse cavity

In this system, the cavity has proven a versatile tool useful for sub-Doppler cavity assisted cooling[1] and sensitive detection of the ion's micro-motion.[2]

  1. [1] Chuah, B.L., Lewty, N.C., Cazan, R., Barrett, M.D., Sub-Doppler Cavity Cooling Beyond The Lamb-Dicke Limit. Physical Review A 87, 043420 (2013).
  2. [2] Chuah, B.L., Lewty, N.C., Cazan, R., Barrett, M.D., Detection of ion micromotion in a linear Paul trap with a high finesse cavity. Optics Express 21(9), 10632 (2013).