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Charged or Not Charged: Quantum Manipulation with Trapped Single Atoms

Speaker:Dr. Yiheng Lin
Affiliation:JILA, NIST and CU Boulder Department of Physics
Date:April 5, 2017 (Wednesday)
Time:11:00 a.m.
Venue:Room 522, 5/F, Chong Yuet Ming Physics Building, HKU


Recent decades have seen techniques being rapidly developed for trapping individual atoms, bringing low system entropy and excellent control of the couplings from the environment, making these atoms ideal building blocks to assemble quantum systems from the bottom-up. This is especially useful for the study of quantum mechanics and quantum engineering. In this talk, I will describe two experiment platforms – trapped atomic ions with electric potential and trapped neutral atoms with optical tweezers, and along the line I will focus on three experiments that shows that both platforms have demonstrated these capabilities. For trapped ions, I will describe a recent demonstration of high fidelity two-qubit quantum logic gate with two 9Be+ ions, and a dissipative production of a maximally entangled state with a 9Be+-24Mg+-24Mg+-9Be+ ion chain. For neutral atoms, I will describe a recent experiment that forms an atomic 50:50 beam splitter by careful control of trapping potentials, and based on this creating spin entanglement between two 87Rb atoms with postselection. At the end I will describe a proposal to further develop these platforms, towards making them reliable and practical devices for quantum manipulation.

Coffee and tea will be served 20 minutes prior to the seminar.
Anyone interested is welcome to attend.