  We describe a new technique (presented in arXiv:1403.1778) to determine the
contribution to the anomalous magnetic moment (g-2) of the muon coming from the
hadronic vacuum polarisation using lattice QCD. Our method uses Pad\'{e}
approximants to reconstruct the Adler function from its derivatives at $q^2=0$.
These are obtained simply and accurately from time-moments of the vector
current-current correlator at zero spatial momentum. We test the method using
strange quark correlators calculated on MILC Collaboration's $n_f$ = 2+1+1 HISQ
ensembles at multiple values of the lattice spacing, multiple volumes and
multiple light sea quark masses (including physical pion mass configurations).
