Robust trapped-ion quantum logic gates by continuous dynamical decoupling
Robust trapped-ion quantum logic gates by continuous dynamical decoupling
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DOI：
10.1103/physreva.85.040302
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发表时间：
2012-04-04
影响因子：
2.9
通讯作者：
Retzker, A.
中科院分区：
文献类型：
--
作者：
Bermudez, A.;Schmidt, P. O.;Retzker, A.
我们介绍了一个方案，结合声子介导的量子逻辑门在囚禁离子与连续动态去耦的好处。我们从理论上证明了量子比特的强驱动使其免受外部磁场噪声的影响，从而提高了双量子比特量子门的保真度。此外，该方案不需要基态冷却，并且对不期望的交流斯塔克位移具有固有的鲁棒性。这种潜在的机制可以扩展到各种其他系统，在这些系统中，强驱动可以保护量子比特的量子相干性，而不会损害两个量子比特的耦合。
We introduce a scheme that combines phonon-mediated quantum logic gates in trapped ions with the benefits of continuous dynamical decoupling. We demonstrate theoretically that a strong driving of the qubit decouples it from external magnetic-field noise, enhancing the fidelity of two-qubit quantum gates. Moreover, the scheme does not require ground-state cooling, and is inherently robust to undesired ac Stark shifts. The underlying mechanism can be extended to a variety of other systems where a strong driving protects the quantum coherence of the qubits without compromising the two-qubit couplings.