Southwest Quantum Information and Technology

Recent progress on trapped-ion quantum information processing at NIST

Presenting Author: Ting Rei Tan, Wineland group (NIST, Boulder)
Contributing Author(s): John Gaebler, Yiheng Lin, Ryan Bowler, Yong Wan, Robert Jordens, Daniel Slichter, David Allcock, Katharine McCormick, Raghavendra Srinivas, Shaun Burd, Susanna Todaro, Justin Bohnet, Joe Britton, John Bollinger, Andrew Wilson, Dietrich Leibfried, David Wineland

Recent experiments on quantum information processing using hyperfine/Zeeman states of trapped 9Be+ and 25Mg+ ions are described. With an improved laser setup including better laser beam quality provided by robust UV optical fibers, two-qubit gate fidelity F  0.999 is achieved. We also realize two-qubit “hybrid” Mølmer-Sørensen, CNOT, and SWAP gates between a 9Be+ - 25Mg+ ion pair. We demonstrate two qubit entanglement (F > 0.99) with an implementation of “quantum Zeno dynamics” subspace engineering technique, which relaxes certain technical requirements. We also summarize progress on (1) spin-squeezing of ~ 100 ions in a Penning trap, (2) all-microwave quantum gates in a surface-electrode trap, (3) cryogenic trap operations, and (4) studies of “anomalous” heating. *Supported by IARPA, ONR, and the NIST Quantum Information Program

(Session 8 : Friday from 2:15 pm - 2:45 pm)