研究目的
Investigating the frequency selected optical storage based on electromagnetically induced transparency in warm atomic vapor to enhance storage capacity for multiplexed quantum memory.
研究成果
The frequency selected optical storage based on electromagnetically induced transparency in warm atomic vapor has been demonstrated, achieving storage efficiencies of 11.6% and 15.6% for different atomic velocities. The theoretical limit of the storage capacity is determined by the ratio of the Doppler broadening width and the EIT linewidth, proposing a new scheme for frequency multiplexed storage.
研究不足
The storage efficiency is limited due to the inevitable four-wave mixing process in warm atomic vapor. The coherence time is reduced by atomic collision.
1：Experimental Design and Method Selection:
A three-level Λ-type model in warm atomic vapor is used to implement an EIT-based storage. The weak probe or signal field and the strong coupling or control field drive the transitions forming a standard Λ-type configuration of EIT.
2：Sample Selection and Data Sources:
The experiment is performed using a heated, magnetically shielded, 5.0-cm-long, rubidium vapor cell of natural isotopic abundance containing 20 torr of Neon buffer gas.
3：0-cm-long, rubidium vapor cell of natural isotopic abundance containing 20 torr of Neon buffer gas.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Two external cavity diode lasers, acousto-optical modulators, beam splitters, polarization beam splitters, photomultiplier, rubidium vapor cell.
4：Experimental Procedures and Operational Workflow:
The probe and coupling beams are modulated and controlled separately to store and retrieve probe pulses with different frequencies.
5：Data Analysis Methods:
The storage efficiency and coherence time are measured and analyzed to evaluate the performance of the frequency selected storage.
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