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The four-body interaction plays an important role in many-body systems, and it can exhibit interesting phase transition behaviors. In this letter, we report the experimental demonstration of a four-body interaction in a four-qubit nuclear magnetic resonance quantum information processor. The strongly modulating pulse is used to implement spin selective excitation. The results show a good agreement...
We give out a scheme of quantum simulation of pairing models on an NMR quantum computer. We show that it can obtain the spectrum of paring model in principle, and present a simple example. Similarly, it is possible to discuss the quantum simulation to obtain more differences of energy levels.
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