Quantum Pseudo-fractional Fourier Transform and its application to quantum phase estimation

Details Quantum Pseudo-fractional Fourier Transform and its application to quantum phase estimation Quantum Pseudo-fractional Fourier Transform and its application to quantum phase estimation

2009-06-05

arxiv.org/abs/0906.1033v1

Physics

Quantum Physics

Scientific paper

- In this paper we present a method to compute the coefficients of the fractional Fourier transform (FrFT) on a quantum computer using quantum gates of polynomial complexity of the order O(n^3). The FrFt, a generalization of the DFT, has wide applications in signal processing and is particularly useful to implement the Pseudopolar and Radon transforms. Even though the FrFT is a non-unitary operation, to develop its quantum counterpart, we develop a unitary operator called the quantum Pseudo-fraction Fourier Transform (QPFrFT) in a higher-dimensional Hilbert space, in order to computer the coefficients of the FrFT. In this process we develop a unitary operator denoted U by which is an essential step to implement the QPFrFT. We then show the application of the operator U in the problem of quantum phase estimation.

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