Quantum Carry-Save Arithmetic
Quantum Carry-Save Arithmetic
复制标题
量子进位保存算法
DOI:
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发表时间:
1998
期刊:
影响因子:
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通讯作者:
Phil Gossett
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文献类型:
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作者:
Phil Gossett
This paper shows how to design efficient arithmetic elements out of quantum gates using "carry-save" techniques borrowed from classical computer design. This allows bit-parallel evaluation of all the arithmetic elements required for Shor's algorithm, including modular arithmetic, deferring all carry propagation until the end of the entire computation. This reduces the quantum gate delay from O(N^3) to O(N log N) at a cost of increasing the number of qubits required from O(N) to O(N^2).