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Precision requirements for spin-echo-based quantum memories

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Heshami, Khabat
Published in Physical Review. A. 2011, vol. 83, no. 3
Abstract Spin-echo techniques are essential for achieving long coherence times in solid-state quantum memories for light because of inhomogeneous broadening of the spin transitions. It has been suggested that unrealistic levels of precision for the radio-frequency control pulses would be necessary for successful decoherence control at the quantum level. Here we study the effects of pulse imperfections in detail, using both a semiclassical and a fully quantum-mechanical approach. Our results show that high efficiencies and low noise-to-signal ratios can be achieved for the quantum memories in the single-photon regime for realistic levels of control pulse precision. We also analyze errors due to imperfect initial-state preparation (optical pumping), showing that they are likely to be more important than control pulse errors in many practical circumstances. These results are crucial for future developments of solid-state quantum memories.
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HESHAMI, Khabat et al. Precision requirements for spin-echo-based quantum memories. In: Physical Review. A, 2011, vol. 83, n° 3. https://archive-ouverte.unige.ch/unige:36618

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Deposited on : 2014-05-13

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