Measurement-induced quantum coherence recovery

Abstract

We show that measurement can recover the quantum coherence of a qubit in a pure dephasing environment. The experimental demonstration of this in an optical system by comparing the visibilities (and fidelities) of the final states with and without measurement is provided here. This method can be extended to other two-level quantum systems and entangled states in a dephasing evolution environment. It may also be used to implement other types of quantum information processing. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.