标题： 基于 dynamical decoupling 的两量子比特量子门对环境噪声的实验性保护 显示英文标题

标题： Experimental protection of 2-qubit quantum gates against environmental noise by dynamical decoupling

摘要： 如果能够结合构成量子比特的有用属性，由不同类型的量子比特组成的混合系统有望用于构建量子计算机。 然而，如果某种量子比特比其他量子比特更容易受到环境噪声的影响，那么这些系统也会带来额外的挑战。 动态解耦可以通过减少环境噪声引起的退相干来帮助保护此类系统，但这种保护必须设计得不会干扰驱动逻辑操作的控制场。 在这里，我们在由钻石中氮-空位中心的电子自旋和核自旋组成的量子寄存器上测试了这种保护方案。 结果显示，处理与保护兼容：退相时间几乎延长到了由电子自旋的纵向弛豫时间决定的极限。 显示英文摘要

摘要： 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.