Adiabatic transfer of coherences in a cluster of coupled nuclear spins (3 pages)

Yadav P. Kandel, Haifeng Qiao, Saeed Fallahi +3 more

Jae‐Seung Lee, Kate E. Cardwell, Anatoly K. Khitrin

It is experimentally demonstrated that quantum coherences can be efficiently transferred using adiabatic energy-level crossing. In a cluster of six dipolar-coupled proton spins of benzene, oriented by a liquid-crystalline matrix, a single-quantum coherence between one pair of states has been adiabatically transferred to another pair of states, and the superposition survived even after ten successive energy-level crossings.

Ferruccio Renzoni, Stig Stenholm

Jae‐Seung Lee, Anatoly K. Khitrin

Abstract Clusters of dipolar‐coupled nuclear spins are excellent model systems for implementing various quantum experiments. The presented examples demonstrate recent techniques of coherent control for spin systems, as well as quantum dynamic schemes, like amplified quantum detection and measurement, state purification, adiabatic transfer of coherences, or projective measurement with NMR. © 2007 Wiley Periodicals, Inc. Concepts Magn Reson Part A 30A: 194–217, 2007.

G. B. Furman, V. Meerovich, Vladimir Sokolovsky

Tommaso Fazio, Anna Napoli, Benedetto Militello

The stimulated Raman adiabatic passage (STIRAP) is applied to a system coupled to a bath made of fully interacting two-level systems whose dynamics is studied by exploiting the generalized cluster correlation expansion (gCCE) theory. We specialize our analysis to a negatively charged silicon vacancy (${\mathrm{V}}_{\mathrm{Si}}^{\ensuremath{-}1}$) in nonpurified 4H-SiC to assess the possibility of transferring population between two states of the ground manifold, also taking into account the interaction with a spherical nuclear-spin bath formed by nuclei of $^{29}\mathrm{Si}$ and $^{13}\mathrm{C}$. For this system, it is demonstrated that the presence of a small- or medium-sized bath has no effect on the protocol, finding in particular a set of parameter values for an efficient STIRAP process.