Robust entanglement by continuous dynamical decoupling of the J-coupling interaction
Robust entanglement by continuous dynamical decoupling of the J-coupling interaction
复制标题
通过 J 耦合相互作用的连续动态解耦实现鲁棒纠缠
DOI:
10.1088/1367-2630/ac320e
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发表时间:
2021
影响因子:
3.3
通讯作者:
Valahu C
中科院分区:
文献类型:
--
作者:
Valahu C
We propose a σ z⊗ σ z laser-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.
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