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Implementation of a Quantum-simulation Algorithm of Calculating Molecular Ground-state Energy on an NMR Quantum Computer

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arxiv 0907.3642 v2 pith:QVTVPSH5 submitted 2009-07-21 quant-ph

classification quant-ph
keywords energyquantumalgorithmcomputerground-statequantum-simulationsimulatealgorithms
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It is exponentially hard to simulate quantum systems by classical algorithms, while quantum computer could in principle solve this problem polynomially. We demonstrate such an quantum-simulation algorithm on our NMR system to simulate an hydrogen molecule and calculate its ground-state energy. We utilize the NMR interferometry method to measure the phase shift and iterate the process to get a high precision. Finally we get 17 precise bits of the energy value, and we also analyze the source of the error in the simulation.

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