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Published in: Quantum Information Processing 3/2017

01-03-2017

Quantum Fourier transform in computational basis

Authors: S. S. Zhou, T. Loke, J. A. Izaac, J. B. Wang

Published in: Quantum Information Processing | Issue 3/2017

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Abstract

The quantum Fourier transform, with exponential speed-up compared to the classical fast Fourier transform, has played an important role in quantum computation as a vital part of many quantum algorithms (most prominently, Shor’s factoring algorithm). However, situations arise where it is not sufficient to encode the Fourier coefficients within the quantum amplitudes, for example in the implementation of control operations that depend on Fourier coefficients. In this paper, we detail a new quantum scheme to encode Fourier coefficients in the computational basis, with fidelity \(1 - \delta \) and digit accuracy \(\epsilon \) for each Fourier coefficient. Its time complexity depends polynomially on \(\log (N)\), where N is the problem size, and linearly on \(1/\delta \) and \(1/\epsilon \). We also discuss an application of potential practical importance, namely the simulation of circulant Hamiltonians.

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Appendix
Available only for authorised users
Footnotes
1
\(\left| y_k - {\tilde{y}}_k \right| < \epsilon \), where \({\tilde{y}}_k\) is the truncated value of \(y_k\) with accuracy \(\epsilon = 2^{-p_0}\).
 
2
\(\left| \left\langle {\Psi ^{\text {final}}}\right| \left( \frac{1}{\sqrt{N}} \sum _{k=0}^{N-1} \left| {k}\right\rangle \left| {{\tilde{y}}_k}\right\rangle \right) \right| \ge 1 - \delta \), where \(\left| {\Psi ^{\text {final}}}\right\rangle \) is the state obtained through the QFTC algorithm.
 
3
\(\Vert \hbox {e}^{-iCt} - \widetilde{\hbox {e}^{-iCt}}\Vert \le \delta \), where \(\widetilde{\hbox {e}^{-iCt}}\) represents the operator that is actually performed by this algorithm.
 
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Metadata
Title
Quantum Fourier transform in computational basis
Authors
S. S. Zhou
T. Loke
J. A. Izaac
J. B. Wang
Publication date
01-03-2017
Publisher
Springer US
Published in
Quantum Information Processing / Issue 3/2017
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-017-1515-0

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