2009/08/31 by Hua Wu, Richard E. George, Arzhang Ardavan +7 · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.105.140503
published as Phys. Rev. Lett. 105, 140503 (2010) · Corrected reference and typos
arxiv created 2010/06/18 · arxiv updated 2011/04/05
Electron and nuclear spins have good coherence times and an ensemble of spins is a promising candidate for a quantum memory. By employing holographic techniques via field gradients a single ensemble may be used to store many bits of information. Here we present a coherent memory using a pulsed magnetic field gradient, and demonstrate the storage and retrieval of up to 100 weak 10 GHz coherent excitations in collective states of an electron spin ensemble. We further show that such collective excitations in the electron spin can then be stored in nuclear spin states, which offer coherence times in excess of seconds.