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

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journal contribution
posted on 2023-06-10, 02:01 authored by Christophe Valahu, A M Lawrence, Sebastian WeidtSebastian Weidt, Winfried HensingerWinfried Hensinger
We propose a sz? szlaser-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.

History

Publication status

  • Published

File Version

  • Published version

Journal

New Journal of Physics

ISSN

1367-2630

Publisher

IOP Publishing

Issue

11

Volume

23

Page range

1-21

Article number

a113012

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2021-12-16

First Open Access (FOA) Date

2021-12-16

First Compliant Deposit (FCD) Date

2021-12-15

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