Hétet, GHosseini, MSparkes, B. MOblak, DLam, P. KBuchler, Benjamin2016-06-072016-06-070146-9592http://hdl.handle.net/1885/102151We propose a photon echo quantum memory scheme using detuned Raman coupling to long lived ground states. In contrast to previous 3-level schemes based on controlled reversible inhomogeneous broadening that use sequences of π-pulses, the scheme does not require accurate control of the coupling dynamics to the ground states. We present a proof of principle experimental realization of our proposal using rubidium atoms in a warm vapour cell. The Raman resonance line is broadened using a magnetic field that varies linearly along the direction of light propagation. Inverting the magnetic field gradient rephases the atomic dipoles and re-emits the light pulse in the forward direction.We also thank the Australian Research Council for financial support.3 pages© 2008 Optical Society of AmericaphotonechoquantummemoryschemeRamancoupling3-levelcontrolledreversibleinhomogeneousPhoton echoes generated by reversing magnetic field gradients in a rubidium vapour2008-10-1510.1364/OL.33.002323