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The transfer of information between different physical forms is a centraltheme in communication and computation, for example between processing entitiesand memory. Nowhere is this more crucial than in quantum computation, wheregreat effort must be taken to protect the integrity of a fragile quantum bit.Nuclear spins are known to benefit from long coherence times compared toelectron spins, but are slow to manipulate and suffer from weak thermalpolarisation. A powerful model for quantum computation is thus one in whichelectron spins are used for processing and readout while nuclear spins are usedfor storage. Here we demonstrate the coherent transfer of a superposition statein an electron spin 'processing' qubit to a nuclear spin 'memory' qubit, usinga combination of microwave and radiofrequency pulses applied to 31P donors inan isotopically pure 28Si crystal. The electron spin state can be stored in thenuclear spin on a timescale that is long compared with the electron decoherencetime and then coherently transferred back to the electron spin, thusdemonstrating the 31P nuclear spin as a solid-state quantum memory. The overallstore/readout fidelity is about 90%, attributed to systematic imperfections inradiofrequency pulses which can be improved through the use of compositepulses. We apply dynamic decoupling to protect the nuclear spin quantum memoryelement from sources of decoherence. The coherence lifetime of the quantummemory element is found to exceed one second at 5.5K.

Solid state quantum memory using the 31P nuclear spin