Abstract:

“Trapped Rydberg ions with their extraordinary properties serve as very good candidates for quantum computing and quantum simulation. The strong dipole-dipole interaction in Rydberg ions enables fast entangling gates between qubits. The entanglement does not involve motional quantum state to exchange information, which makes it suitable to perform gate operations in a long ion string. In this report, preliminary studies for cooling the trapped ions using polarization gradient cooling and addressing of single ion in a long ion string have been done. The results show that for cooling of multiple ions in a linear chain, a combination of Doppler cooling and polarization gradient cooling provides better cooling as compared to Doppler cooling alone. Simulations for single ion addressing shows that the focusing of the beams on the ions can be further improved by using additional optics described by the simulation. Better focusing is essential to deliver higher laser intensities to the
ion such that the Rabi frequency is higher. This is important for improving the fidelity of gate operation in long ion strings.”