Quantum Fourier Transform in a Decoherence-Free Subspace

Details Quantum Fourier Transform in a Decoherence-Free Subspace Quantum Fourier Transform in a Decoherence-Free Subspace

2004-09-19

arxiv.org/abs/quant-ph/0409122v1

Physics

Quantum Physics

7 pages, 6 figures

Scientific paper

Quantum Fourier transform is of primary importance in many quantum algorithms. In order to eliminate the destructive effects of decoherence induced by couplings between the quantum system and its environment, we propose a robust scheme for quantum Fourier transform over the intrinsic decoherence-free subspaces. The scheme is then applied to the circuit design of quantum Fourier transform over quantum networks under collective decoherence. The encoding efficiency and possible improvements are also discussed.

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