Tan, Ting-Rei
Date: Thursday, November 26, 2015
Time: 11:00
Place: ETH Zurich, Hönggerberg, HPF G 6
Host: Jonathan Home
Mixed-Species Logic Gates for Trapped-Ion Qubits
Ting-Rei Tan
National Institute of Standards and Technology, Boulder, USA
Precision control over hybrid physical systems at the quantum level is important for the realization of many quantum-based technologies. For trapped-ions, a hybrid system formed of different species introduces extra degrees of freedom that can be exploited to expand and refine the control of the system. We demonstrate an entangling gate between two atomic ions of different elements that can serve as an important building block of quantum information processing (QIP), quantum networking, precision spectroscopy, metrology, and quantum simulation. An entangling geometric phase gate between a 9Be+ ion and a 25Mg+ ion is realized through a spin-spin interaction generated by state-dependent forces. A Bell state is created with this mixed-species gate with a fidelity of 0.979(1), and we obtain a sum of correlations of 2.70(2) by performing a CHSH-type Bell inequality test on this state. We also use the mixed-species gate to construct a SWAP gate that interchange the quantum states of the two dissimilar qubits. Lastly, I will briefly report our recent efforts on implementing high-fidelity entangling gate and single-qubit gate with 9Be+ ion.