Quantum Optics

Mr.Joe Wong (Ph.D.) has been focusing on the quantum computing and quantum network by the system of trapped ion and related quantum photonics technology, to achieve the goal of establishing the distributed quantum computer on a long term scale.

The Trapped Ion Quantum Network Research and Achievements

The ion trap system is a combination of electric or magnetic fields used to capture charged particles. We have successfully developed two trapped Yb+ ion systems(Needle trap and the Paul trap) for single and multi-ions research respectively. The system is including an Ultra High Vacuum Environment (below 1e-12torr) to isolate the single charged atom ion from the external environment. By four different wavelengths lasers along with the optical systems, the quantum information can be stored and computed on with the atom ion. The microscopic objective lens with NA~0.4 is designed to collect and determine the quantum state with the total efficiency of 1.1% (take into account that probing detector 30% efficiency and the transmission effectiveness at 90%). Alternatively, with a higher Numerical Aperture objective lens, resulting in a deterministic better collective efficiency further greater readout fidelity of the quantum information. The ion coherence time of T1 tested is 77ms, having the system upgraded, Joe and Hyperion Optics together developed an NA0.7 micro-objective lens. It is not only to increase the photon collective efficiency but also to implement the single ion addressing in the multi-ion chain.