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Quantum memories provide intermediate storage of quantum information until itis needed for the next step of a quantum algorithm or a quantum communicationprocess. Relevant figures of merit are therefore the fidelity with which theinformation can be written and retrieved, the storage time, and also the speedof the read-write process. Here, we present experimental data on a quantummemory consisting of a single $^{13}$C nuclear spin that is strongly coupled tothe electron spin of a nitrogen-vacancy (NV) center in diamond. The stronghyperfine interaction of the nearest-neighbor carbon results in transfer timesof 300 ns between the register qubit and the memory qubit, with an overallfidelity of 88 % for the write - storage - read cycle. The observed storagetimes of 3.3 ms appear to be limited by the T$_1$ relaxation of the electronspin. We discuss a possible scheme that may extend the storage time beyond thislimit.

Room-temperature high-speed nuclear-spin quantum memory in diamond