Experimental protection of two-qubit quantum gates against environmental noise by dynamical decoupling.
Experimental protection of two-qubit quantum gates against environmental noise by dynamical decoupling.
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DOI：
10.1103/physrevlett.115.110502
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发表时间：
2015-04
影响因子：
8.6
通讯作者：
Jingfu Zhang;D. Suter
中科院分区：
文献类型：
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作者：
Jingfu Zhang;D. Suter
由不同类型的量子比特组成的混合系统如果结合了它们组成的量子比特的有用性质，就有可能用来建造量子计算机。然而，如果一种类型的量子比特比其他类型的量子比特更容易受到环境噪声的影响，它们也会带来额外的挑战。动态解耦可以通过减少由于环境噪声引起的退相干来帮助保护这样的系统，但保护必须设计成不干扰驱动逻辑运算的控制场。在这里，我们在一个量子寄存器上测试了这样的保护方案，该寄存器由钻石中氮空位中心的电子自旋和核自旋组成。结果表明，处理与保护是相容的：退相时间几乎延长到电子自旋纵向弛豫时间所给出的极限。
Hybrid systems consisting of different types of qubits are promising for building quantum computers if they combine useful properties of their constituent qubits. However, they also pose additional challenges if one type of qubits is more susceptible to environmental noise than the others. Dynamical decoupling can help to protect such systems by reducing the decoherence due to the environmental noise, but the protection must be designed such that it does not interfere with the control fields driving the logical operations. Here, we test such a protection scheme on a quantum register consisting of the electronic and nuclear spins of a nitrogen-vacancy center in diamond. The results show that processing is compatible with protection: The dephasing time was extended almost to the limit given by the longitudinal relaxation time of the electron spin.