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High-Capacity Angularly Multiplexed Holographic Memory Operating at the Single-Photon Level.

Radosław Chrapkiewicz¹, Michał Dąbrowski¹, Wojciech Wasilewski¹

¹Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland.

Physical Review Letters

|February 25, 2017

Summary

This summary is machine-generated.

Researchers developed a holographic memory using rubidium-87 vapor to store and retrieve multiple photons. This quantum memory demonstrated capacity for 60 atomic spin-wave modes, advancing quantum information processing.

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Area of Science:

Quantum optics
Atomic physics
Holographic data storage

Background:

Quantum memory is crucial for quantum communication and computation.
Storing and retrieving multiple photons efficiently remains a challenge.
Raman interactions in atomic vapors offer a promising platform for quantum memory.

Purpose of the Study:

To experimentally demonstrate an angularly multiplexed holographic memory.
To achieve intrinsic generation, storage, and retrieval of multiple photons.
To explore the capacity and lifetime of atomic spin-wave modes for quantum memory.

Main Methods:

Utilized off-resonant Raman interaction in warm rubidium-87 vapors.
Employed angular multiplexing for holographic storage.
Analyzed angular distributions of photon coincidences (Stokes and anti-Stokes) to evidence memory capacity.

Main Results:

Demonstrated a holographic memory with a capacity of up to 60 independent atomic spin-wave modes.
Observed storage and retrieval of single spin-wave excitations.
Achieved a memory lifetime of several microseconds.

Conclusions:

The demonstrated holographic memory enables intrinsic multi-photon generation, storage, and retrieval.
The system shows potential for scalable quantum information processing.
Proposed combining the memory with optical switches to enhance photon generation rates.