Thermal Spin Chains, Quantum Mirrors, and Room Temperature Quantum Computation with Diamond Color Centers

Norman Yao, Harvard University

We propose an experimentally feasible architecture for a room-temperature solid-state quantum computer utilizing nitrogen-vacancy (NV) defects in diamond as qubits and demonstrate the possibility of high fidelity operations. At an implantation spacing of 20nm, magnetic dipole-dipole interactions are sufficiently strong to enable coherent coupling of qubits. We further investigate remote spin coupling as a candidate for reducing the experimental constraints on such implementations. This approach makes use of a two-dimensional array of nitrogen impurities with sparsely implanted NV center qubits. By utilizing nitrogen impurities to mediate quantum state transfer, it is possible to coherently couple spatially separated qubits using SWAP gate, spin chain, and quantum mirror techniques. Finally, we show that perfect state transfer is possible through completely thermal spin chains of arbitrary length using only Hamiltonian evolution.

Abstract Author(s): Norman Y. Yao, Liang Jiang, Alexey V. Gorshkov, Mikhail D. Lukin