Author:
Draper T.G.,Kutin S.A.,Rains E.M.,Svore K.M.
Abstract
We present an efficient addition circuit, borrowing techniques from classical carry-lookahead arithmetic. Our quantum carry-lookahead (\QCLA) adder accepts two n-bit numbers and adds them in O(\log n) depth using O(n) ancillary qubits. We present both in-place and out-of-place versions, as well as versions that add modulo 2^n and modulo 2^n - 1. Previously, the linear-depth ripple-carry addition circuit has been the method of choice. Our work reduces the cost of addition dramatically with only a slight increase in the number of required qubits. The \QCLA\ adder can be used within current modular multiplication circuits to reduce substantially the run-time of Shor's algorithm.
Subject
Computational Theory and Mathematics,General Physics and Astronomy,Mathematical Physics,Nuclear and High Energy Physics,Statistical and Nonlinear Physics,Theoretical Computer Science
Cited by
22 articles.
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