Experimental fault-tolerant universal quantum gates with solid-state spins under ambient conditions.
Experimental fault-tolerant universal quantum gates with solid-state spins under ambient conditions.
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环境条件下具有固态自旋的实验容错通用量子门
DOI：
10.1038/ncomms9748
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发表时间：
2015-11-25
影响因子：
16.6
通讯作者：
Du J
中科院分区：
文献类型：
--
作者：
Rong X;Geng J;Shi F;Liu Y;Xu K;Ma W;Kong F;Jiang Z;Wu Y;Du J
量子计算在某些问题上比经典计算提供了更大的加速。量子计算的关键挑战之一是在存在噪声的情况下实现对量子系统的精确控制。在环境条件下，以容错量子计算所需的精度控制固体中的自旋量子比特仍然是难以捉摸的。在这里，我们定量地描述了量子门操作过程中的噪声源，并演示了抑制这些影响的策略。本文报道了一组在金刚石中氮空位中心的通用逻辑门，其平均单量子位门保真度为0.999952，双量子位门保真度为0.992。通过复合脉冲和优化的控制方法，在室温下在天然丰富的13 C金刚石中实现了这些高控制结晶度。
Quantum computation provides great speedup over its classical counterpart for certain problems. One of the key challenges for quantum computation is to realize precise control of the quantum system in the presence of noise. Control of the spin-qubits in solids with the accuracy required by fault-tolerant quantum computation under ambient conditions remains elusive. Here, we quantitatively characterize the source of noise during quantum gate operation and demonstrate strategies to suppress the effect of these. A universal set of logic gates in a nitrogen-vacancy centre in diamond are reported with an average single-qubit gate fidelity of 0.999952 and two-qubit gate fidelity of 0.992. These high control fidelities have been achieved at room temperature in naturally abundant13C diamond via composite pulses and an optimized control method.