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中国科学通报：英文版

Simulation of the four-body interaction in a nuclear magnetic resonance quantum information processor

Liu ., WenZhang, Zhang, Jingfu, Long, Gui-Lu

Published Jan 1, 2009• 4 citations
OpenAlex

Abstract

四身体的相互作用在许多身体起一个重要作用系统，和它能展出有趣的阶段转变行为。在这封信，我们在 four-qubit 报导一个四身体的相互作用的试验性的示范原子磁性的回声量信息处理器。强烈， modulating 脉搏被用来实现纺纱选择刺激。结果显示出在理论和实验之间的一个好协议。

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arXiv:1712.08711•Communications Physics•Oct 4, 2019•44 citations
四身体的相互作用在许多身体起一个重要作用系统，和它能展出有趣的阶段转变行为。在这封信，我们在 four-qubit 报导一个四身体的相互作用的试验性的示范原子磁性的回声量信息处理器。强烈， modulating 脉搏被用来实现纺纱选择刺激。结果显示出在理论和实验之间的一个好协议。
Four-body interaction plays an important role in many-body systems, and it can exhibit interesting phase transition behaviors. Historically it was the need to efficiently simulate quantum systems that lead the idea of a quantum computer. 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 between theory and experiment.
Abstract Quantum simulation has shown its irreplaceable role in many fields, where it is difficult for classical computers to do much. On a four-qubit Nuclear Magnetic Resonance (NMR) quantum simulator, we experimentally simulate the spin-network states by simulating quantum spacetime tetrahedra. The fidelities of our experimentally prepared quantum tetrahedra are all above 95%. We then use the quantum tetradedra prepared by the Nuclear Magnetic Resonance to simulate a spinfoam vertex amplitude, which displays the local dynamics of quantum spacetime. By measuring the geometric properties on the corresponding quantum tetrahedra and simulating their interaction, our experiment serves as a basic module that represents the Feynman diagram vertex in the spinfoam formulation of Loop Quantum Gravity(LQG). This is an initial attempt to study LQG by quantum information processing.