Abstract
We theoretically investigate the dynamics of environment and coherence behaviours of the central ion in a quantum memory based on a rare-earth doped crystal. The interactions between the central ion and the bath spins suppress the flip-flop rate of the neighbour bath spins and yield a specific environment spectral density S(ω). Under dynamical decoupling pulses, this spectrum provides a general scaling for the coherence envelope and coherence time, which significantly extend over a range on an hour-long time scale. The characterized environment spectrum with ultra-long coherence time can be used to implement various quantum communication and information processing protocols.
Highlights
We theoretically investigate the dynamics of environment and coherence behaviours of the central ion in a quantum memory based on a rare-earth doped crystal
The dynamical decoupling sequences of interest are manipulated at the radio frequency (RF) frequency, and the resultant ion coherence is determined by Raman heterodyne detection using an additional optical pulse at the rephasing time
This environment spectrum is bath to the Eu ion, and τc is the characterized by correlation time two parameof the Y bath spins, which is related to their flip-flop rate
Summary
We theoretically investigate the dynamics of environment and coherence behaviours of the central ion in a quantum memory based on a rare-earth doped crystal. We model the composite system of the Eu ion and Y bath to obtain a Lorentzian-shape spectral density S(ω) with significantly long correlation time τc.
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