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Bulletin of the American Physical Society

Toward strong coupling of a single NV center in diamond to a superconducting circuit

Philippe Campagne-Ibarcq, Sebastian Probst, P. Jamonneau, Yuimaru Kubo, Audrey Bienfait, Sébastien Pezzagna, Patrice Bertet

Published Mar 16, 2017• 0 citations
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arXiv:1503.02437•Physical Review Applied•Oct 8, 2015•95 citations
We propose a scheme to couple NV centers in diamond through coplanar waveguide resonators. The central conductor of the resonator is split into several pieces which are coupled strongly with each other via simple capacitive junctions or superconducting Josephson junctions. The NV centers are then put at the junctions. The discontinuity at the junctions induces a large local magnetic field, with which the NV centers are strongly coupled to the circuit resonator. The coupling strength ggg between the resonator and the NV center is of order of g/2π∼1g/2π\sim 1g/2π∼1--$30\unit{MHz}$.
Nitrogen-vacancy (NV) centers in diamond and superconducting qubits are two promising solid-state quantum systems for quantum science and technology, but the realization of controlled interfaces between individual solid-state spins and superconducting qubits remains fundamentally challenging. Here, we propose and analyze a hybrid quantum system consisting of a magnetic skyrmion, an NV center, and a superconducting qubit, where the solid-state qubits are both positioned in proximity to the skyrmion structure in a thin magnetic disk. We show that it is experimentally feasible to achieve strong (coherent or dissipative) coupling between the NV center and the superconducting qubit by using the as an intermediary. This allows coherent information transfer and nonreciprocal responses between the NV center and the superconducting qubit at the single quantum level with high controllability. The proposed platform provides a scalable pathway for implementing quantum protocols that synergistically exploit the complementary advantages of spin-based quantum memories, microwave-frequency superconducting circuits, and topologically protected magnetic excitations.
Research into hybrid quantum systems is of great interest for quantum information processing; however, a key challenge is finding a controlled interface between a superconducting circuit and a lone solid-state qubit. The authors design a coherent quantum interface between a microwave cavity and a single nitrogen-vacancy center in a mechanical resonator made of diamond. Here the coupling between the quantized motion of the diamond beam and the cavity photons is due to dielectric interaction, not the traditional capacitive coupling, and is scalable to large arrays of resonators for e.g. a memory chip.