Universal quantum information processing requires single-qubit rotations and two-qubit interactions as minimal resources. A possible step beyond this minimal scheme is the use of three-qubit interactions. We consider such three-qubit interactions and show how they can reduce the time required for a quantum state transfer in an XY spin chain. For the experimental implementation, we use liquid-state nuclear magnetic resonance (NMR), where three-qubit interactions can be implemented by sequences of radio-frequency pulses.
@article{arxiv.quant-ph/0512229,
title = {Speedup of quantum state transfer by three- qubit interactions: Implementation by nuclear magnetic resonance},
author = {Jingfu Zhang and Xinhua Peng and Dieter Suter},
journal= {arXiv preprint arXiv:quant-ph/0512229},
year = {2007}
}