Inverting well conditioned matrices in quantum logspace

  title={Inverting well conditioned matrices in quantum logspace},
  author={Amnon Ta-Shma},
We show that quantum computers improve on the best known classical algorithms for matrix inversion (and singular value decomposition) as far as space is concerned. This adds to the (still short) list of important problems where quantum computers are of help. Specifically, we show that the inverse of a well conditioned matrix can be approximated in quantum logspace with intermediate measurements. This should be compared with the best known classical algorithm for the problem that requires Ω(log2… CONTINUE READING
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