Experimental fault-tolerant universal quantum gates with solid-state spins under ambient conditions

Xing Rong, Jianpei Geng, Fazhan Shi, Ying Liu, Kebiao Xu, Wenchao Ma, Fei Kong, Zhen Jiang, Yang Wu and Jiangfeng Du ()
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Xing Rong: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China
Jianpei Geng: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China
Fazhan Shi: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China
Ying Liu: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China
Kebiao Xu: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China
Wenchao Ma: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China
Fei Kong: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China
Zhen Jiang: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China
Yang Wu: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China
Jiangfeng Du: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract 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 abundant 13C diamond via composite pulses and an optimized control method.

Date: 2015
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DOI: 10.1038/ncomms9748

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