研究目的
Investigating the rephasing efficiency of sequences of phased pulses in spin echoes and light storage by electromagnetically induced transparency (EIT) to understand the sensitivity to pulse phases and differences due to spatial retardation.
研究成果
The rephasing efficiency is highly sensitive to pulse phases and differs between spin echoes and EIT light storage due to spatial retardation. CPMG sequences with pulse errors are not suitable for arbitrary quantum states in memories. Experiments confirm theoretical predictions, highlighting the importance of phase control in rephasing protocols.
研究不足
The model assumes noninteracting three-state systems, neglects effects like reabsorption in EIT, and may not hold for very short pulse separations or large pulse errors. Experimental limitations include inhomogeneous broadening and spatial field inhomogeneity.
1：Experimental Design and Method Selection:
The study uses a theoretical model for rephasing efficiency and experimental verification in a Pr3+:Y2SiO5 crystal. Methods include spin echo and EIT light storage protocols with phased pulse sequences.
2：Sample Selection and Data Sources:
A Pr3+:Y2SiO5 crystal with 0.05 at.% praseodymium dopant concentration, length 3.2 mm, cooled to 4 K in a liquid-helium cryostat.
3：05 at.% praseodymium dopant concentration, length 2 mm, cooled to 4 K in a liquid-helium cryostat.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Pr3+:Y2SiO5 crystal, liquid-helium cryostat, optical and radio frequency (rf) pulse generators, photo diode, lock-in amplifier, rf coils.
4：Experimental Procedures and Operational Workflow:
Optical pumping to prepare initial state, write process with rf π/2 pulse or EIT light storage, rephasing with phased rf pulses, read process with Raman heterodyne detection or EIT readout, measurement of rephasing efficiency.
5：Data Analysis Methods:
Theoretical simulations based on derived formulas, comparison with experimental data using normalization and averaging techniques.
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