Evaluation of Rabi frequency and coherence time in the hyperfine structure of 167Er3+ in Y2SiO5 through coherent transients

Summary form only given. We demonstrate coherent transients -Rabi oscillation and a photon echo- between hyperfine levels in isotopically purified167Er3+in Y2SiO5crystal at zero magnetic field. These observations provide us with optical param-eters such as the Rabi frequency and coherence time, which are indispensable for coherent manipulation of167Er3+electronic states. The estimated coherence time is longer than that in degenerated levels, which indicates that the use of the hyperfine sublevels in167Er3+is expected to exhibit longer memory time in quantum memories.