Novel Ion Trap for Efficient Fluorescence Collection from Ion Qubits

Critical aspects of Trapped Ion Quantum Computation and Information such as qubit state readout and entanglement generation can directly benefit from improving the collection efficiency of ion fluorescence. By integrating a simple reflective optics to a linear Paul trap, we achieved a 10\% photon collection efficiency. To eliminate photon blocking due to the trap structure and to further increase the collection efficiency, we built a novel trap combining the reflective optical surface and RF electrode. While at least doubling the collection efficiency, the new trap enjoys the nice future of self-aligning with full electric/optical controlling. We expect to be able to efficiently couple the ion fluorescence photons into a single mode optical fiber for remote manipulation and entanglement of ions.