  In this article we study the role that quantum resources play in quantum
error correction assisted quantum metrology (QECQM) schemes. We show that there
exist classes of such problems where entanglement is not necessary to retrieve
noise free evolution and Heisenberg scaling in the long time limit. Over short
time scales, noise free evolution is also possible even without any form of
quantum correlations. In particular, for qubit probes, we show that whenever
noise free quantum metrology is possible via QECQM, entanglement free schemes
over long time scales and correlation free schemes over short time scales are
always possible.
