A note on quantum algorithms and the minimal degree of ε-error polynomials for symmetric functions

  • Authors:
  • Ronald de Wolf

  • Affiliations:
  • CWI. Amsterdam, The Netherlands

  • Venue:
  • Quantum Information & Computation
  • Year:
  • 2008

Quantified Score

Hi-index 0.00

Visualization

Abstract

The degrees of polynomials representing or approximating Boolean functions are aprominent tool in various branches of complexity theory. Sherstov [31] recently characterizedthe minimal degree degε(f) among all polynomials (over R) that approximatea symmetric function f : {0, 1}n → {0, 1} up to worst-case error ε: degε(f) =Θ(deg1/3(f) + √n log(1/ε). In this note we show how a tighter version (without thelog-factors hidden in the Θ-notation), can be derived quite easily using the close connectionbetween polynomials and quantum algorithms.