A Frequency-Multiplexed Coherent Electro-optic Memory in Rare Earth Doped Nanoparticles.

Area of Science:

• Quantum optics
• Materials science
• Quantum information science

Background:

• Quantum memories are crucial for quantum communication and computing.
• Rare earth doped nanoparticles offer advantages over bulk materials for quantum applications.
• Nanoparticle-based quantum memories enable enhanced light coupling and material design.

Purpose of the Study:

• To report coherent light storage in Eu³⁺:Y₂O₃ nanoparticles.
• To investigate the potential of these nanoparticles for nanoscale optical quantum memories.
• To demonstrate the capabilities of the Stark echo modulation memory (SEMM) protocol in this system.

Main Methods:

• Utilized the Stark echo modulation memory (SEMM) quantum protocol.
• Measured the Stark coefficient across a 15 GHz bandwidth.
• Demonstrated coherent light storage and retrieval.
• Stored and retrieved pulses at two different frequencies to confirm multiplexing capability.

Main Results:

• Achieved a nearly constant Stark coefficient of 50 kHz/(V/cm) over a 15 GHz bandwidth.
• Demonstrated coherent light storage with an effective coherence lifetime of 5 μs.
• Confirmed frequency-multiplexing capability by storing two different frequency pulses.
• Showcased high phase fidelity of the quantum memory.

Conclusions:

• Eu³⁺:Y₂O₃ nanoparticles are promising for nanoscale optical quantum memories.
• The SEMM protocol enables efficient light storage with high fidelity.
• These results pave the way for advanced quantum technologies utilizing nanoscale quantum memories.