Efficient optical pumping and quantum storage in a Nd:YVO nanocavity

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Fig. 3 Efficient optical pumping and quantum storage in a Nd:YVO nanocavity. Efficient optical pumping and quantum storage in a Nd:YVO nanocavity. (A) Magnetic field configuration with Zeeman spin levels and transitions (a to d) of Nd3+ (only isotopes with 0 nuclear spins). (B) Spectral hole decays from which spin lifetimes were extracted. tw, wait time between optical pumping and the probe pulse. (C) Optical pumping dynamics showing an enhanced spin polarization in the nanocavity [ρ1 < 5% (blue), versus ~20% (red) in the bulk]. The inset shows the AOM modulation sequence. The bulk spin population was measured by the transmission of the probe pulse (red). The cavity was probed using photoluminescence counts after the probe excitation (blue). (D) An AFC with F = 3.3 and ~400 ions in each tooth. Gray, 100-kHz resolution; black, 500-kHz resolution. (E) Input (black line), reflected (blue area), and AFC echo signal of a coherent state (mean photon number α = 0.58) time-bin mode from the nanocavity. The inset shows the lower bounds on the qubit storage fidelity for a set of inputs, with an arithmetic mean fidelity of 96.8%. Error bars, standard deviation. Tian Zhong et al. Science 2017;357:1392-1395 Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works