Entangling trapped ions with a low-frequency magnetic field gradient

Presenting Author: David Allcock, National Institute of Standards and Technology, Boulder
Contributing Author(s): Raghavendra Srinivas, Shaun Burd, Daniel Slichter, Andrew Wilson, Dietrich Leibfried, David Wineland

Entangled states of trapped ions are typically generated using laser-induced spin-motion coupling. Spin-motion coupling with hyperfine qubits has also been demonstrated with microwave magnetic fields instead of lasers, thus eliminating photon scattering errors and offering potential benefits for scalability. These experiments have relied on either static magnetic field gradients or oscillating magnetic field gradients at GHz frequencies[1-4]. We present a method of spin-motion coupling using microwaves and a magnetic field gradient oscillating at MHz frequencies, related to the optical method discussed in [5]. We entangle the internal states of two trapped 25Mg+ ions in a cryogenic microfabricated surface-electrode trap and characterize the Bell-state fidelity. This implementation offers important technical advantages over both the static-gradient and GHz-gradient techniques. [1] Mintert and Wunderlich PRL 87, 257904 (2001) [2] Weidt et al. PRL 117, 220501 (2016) [3] Ospelkaus et al. Nature 476, 181 (2011) [4] Harty et al. PRL 117, 140501 (2016) [5] Ding et al. PRL 113, 073002 (2014)

(Session 1 : Thursday from 9:15am-9:45am)


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