Nuclear magnetic resonance (NMR) quantum computation in a crystal lattice holds more promise for scalability than its solution NMR counterpart, but dephasing is a severe concern. Pulse sequence refocusing can help bring the qubit dephasing time closer to the limit of the intrinsic decoherence time, but the intrinsic transverse relaxation time (T2) and the longitudinal relaxation time (T1) of the crystal must be sufficiently long for a successful implementation. We discuss these time scales and their relation to parameters relevant to quantum computation for several crystal types, discussing in detail the examples of CaF2, MnF2, and CeP. Included in the calculation of coherence times for CeP is the development of spin-wave spectra in a type-1 antiferromagnetic FCC lattice.
Applied Physics A: Materials Science & Processing
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- PACS: 03.67.Lx;