Process Tomography of a Silicon Quantum Memory

Long coherence times and fast manipulation are two desirable qualities of a qubit that for many systems are mutually incompatible. Storing quantum information in an ancillary qubit, i.e. a `quantum memory’, is a strategy to address this issue. It is a advantageous property of donor impurities in silicon to have qubits of both qualities in a single lattice site. This talk will present results of the storage and retrieval of quantum information from a single donor electron spin to its host phosphorus nucleus in isotopically-enriched $^{28}$Si. We demonstrate a high fidelity memory process characterised via both state and process tomography. A tutorial-style introduction to state and process tomography will precede the results.