The development of moderate scale quantum devices requires stable quantum bits in which we can process, store and transport quantum information. Superconducting flux qubits are well known for their processing ability while electron-spin nitrogen-vacancy centers in diamond are a natural memory candidate. Here we report on strong coupling and coherent exchange of a single quantum of energy between these hybrid systems as well as the realization of a quantum memory operation.

© 2013 Optical Society of America

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