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Nat Commun. 2015 Nov 25;6:8748. doi: 10.1038/ncomms9748.

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

Rong X1,2,3, Geng J1,2, Shi F1,2,3, Liu Y1,2, Xu K1,2, Ma W1,2, Kong F1,2, Jiang Z1,2, Wu Y1,2, Du J1,2,3.

Author information

1
Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.
2
Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China.
3
Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.

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 (13)C diamond via composite pulses and an optimized control method.

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