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Quantum computation based on nitrogen-vacancy center in diamond

Pengfei Wang, Fazhan Shi, Du Jiangfeng

Published May 31, 2014• 0 citations
Publisher
DOI
10.3969/j.issn.0253-2778.2014.05.002

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The nitrogen-vacancy center (NVC) in diamond is an exciting candidate system for building a quantum computer, because of its long coherence time at the relatively high temperature of 5 K. Scaling up to a useful quantum computer requires having an array of many individual NVCs in one diamond; such arrays can be created, but suffer from much shorter coherence times than in natural NVCs. This study uses laser writing to create arrays of single NVCs with ``natural'' spin coherence times, at the right depth for use with optical cavities, enabling arrays of 200,000 coherent NVCs per diamond.
Quantum computers have the potential to speed up certain problems that are hard for classical computers. Hybrid systems, such as the nitrogen-vacancy (NV) center in diamond, are among the most promising systems to implement quantum computing, provided the control of the different types of qubits can be efficiently implemented. In the case of the NV center, the anisotropic hyperfine interaction allows one to control the nuclear spins indirectly, through gate operations targeting the electron spin, combined with free precession. Here, we demonstrate that this approach allows one to implement a full quantum algorithm, using the example of Grover's quantum search in a single NV center, whose electron is coupled to a carbon nuclear spin.