Robust entanglement by continuous dynamical decoupling of the J-coupling interaction

Valahu, C H, Lawrence, A M, Weidt, S and Hensinger, W K (2021) Robust entanglement by continuous dynamical decoupling of the J-coupling interaction. New Journal of Physics, 23 (11). a113012 1-21. ISSN 1367-2630

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Abstract

We propose a σz⊗ σzlaser-free entangling gate which uses the intrinsic J-coupling of ions in a static magnetic gradient. Dephasing of the interaction is suppressed by means of continuous dynamical decoupling using pairs of microwave fields. The gate is virtually insensitive to common amplitude noise of the microwave fields and enables high fidelities despite qubit frequency fluctuations, while the J-coupling interaction's inherent robustness to motional decoherence is retained. Errors far below the fault-tolerant threshold can be achieved at high initial temperatures, negating the requirement of sideband cooling below the Doppler temperature. By adjusting the powers of the continuous microwave fields, the J-coupling interaction can be tuned and can be used to implement parallel entangling gates within an ion chain.

Item Type: Article
Keywords: trapped ions, dressed states, continuous dynamical decoupling, microwave QIP, robust entangling gates, quantum computing
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 16 Dec 2021 08:12
Last Modified: 16 Dec 2021 08:15
URI: http://sro.sussex.ac.uk/id/eprint/103393

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