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arXiv quant-ph/0302138quant-ph
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用量子线路实现Grover算法的哈密顿形式

Quantum circuit implementation of the Hamiltonian versions of Grover's algorithm

J. Roland, N. J. Cerf

摘要:

我们分析了三种不同的量子搜索算法,传统的Grover算法,其连续时间模拟的哈密顿演化,最后的量子搜索的局部绝热演化。我们表明,它们是密切相关的算法,在这个意义上说,他们都执行一个旋转,在一个恒定的角速度,从一个统一的叠加的所有状态的解决方案状态。这使得后两种算法可以在常规的量子线路上通过哈密顿演化实现,同时保持Grover算法的二次加速比。

英文摘要:

We analyze three different quantum search algorithms, the traditional Grover's algorithm, its continuous-time analogue by Hamiltonian evolution, and finally the quantum search by local adiabatic evolution. We show that they are closely related algorithms in the sense that they all perform a rotation, at a constant angular velocity, from a uniform superposition of all states to the solution state. This make it possible to implement the last two algorithms by Hamiltonian evolution on a conventional quantum circuit, while keeping the quadratic speedup of Grover's original algorithm.

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