Selective coherence transfers in homonuclear dipolar coupled spin systems

Details Selective coherence transfers in homonuclear dipolar coupled spin systems Selective coherence transfers in homonuclear dipolar coupled spin systems

2004-08-25

arxiv.org/abs/quant-ph/0408158v2

Phys. Rev. A 71, 020303(R) (2005)

Physics

Quantum Physics

4 pages. Paper re-submitted with minor changes to clarify that the scheme demonstrated is not an exact mapping onto a nearest

Scientific paper

10.1103/PhysRevA.71.020303

Mapping the physical dipolar Hamiltonian of a solid-state network of nuclear spins onto a system of nearest-neighbor couplings would be extremely useful for a variety of quantum information processing applications, as well as NMR structural studies. We demonstrate such a mapping for a system consisting of an ensemble of spin pairs, where the coupling between spins in the same pair is significantly stronger than the coupling between spins on different pairs. An amplitude modulated RF field is applied on resonance with the Larmor frequency of the spins, with the frequency of the modulation matched to the frequency of the dipolar coupling of interest. The spin pairs appear isolated from each other in the regime where the RF power (omega_1) is such that omega_weak << omega_1 << omega_strong. Coherence lifetimes within the two-spin system are increased from 19 us to 11.1 ms, a factor of 572.

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