Physics – Quantum Physics
Scientific paper
1999-04-28
Phys.Rev.A61:042310,2000
Physics
Quantum Physics
7 pages, 4 figures, mypsfig2, revtex, submitted April 27, 1999
Scientific paper
10.1103/PhysRevA.61.042310
We present an efficient scheme which couples any designated pair of spins in heteronuclear spin systems. The scheme is based on the existence of Hadamard matrices. For a system of $n$ spins with pairwise coupling, the scheme concatenates $cn$ intervals of system evolution and uses at most $c n^2$ pulses where $c \approx 1$. Our results demonstrate that, in many systems, selective recoupling is possible with linear overhead, contrary to common speculation that exponential effort is always required.
Chuang Isaac L.
Leung Debbie W.
Yamaguchi Fumiko
Yamamoto Yoshihisa
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