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Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
Storage and retrieval of a squeezed vacuum
Kazuhito Honda1, Daisuke Akamatsu, Manabu Arikawa
1Interactive Research Center of Science, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8550, Japan.
Physical Review Letters
|March 21, 2008
Summary
Researchers demonstrated storage and retrieval of squeezed vacuum using electromagnetically induced transparency in laser-cooled rubidium-87 atoms. This quantum memory technique successfully stored and retrieved a squeezed vacuum pulse after a 3-microsecond delay.
Area of Science:
- Quantum Optics
- Atomic Physics
Background:
- Electromagnetically induced transparency (EIT) enables control over light propagation in atomic media.
- Squeezed vacuum states are non-classical light states with reduced quantum noise, crucial for quantum information processing.
Purpose of the Study:
- To demonstrate the storage and retrieval of a squeezed vacuum pulse using EIT in cold atomic ensembles.
- To investigate the feasibility of quantum memory for non-classical light states.
Main Methods:
- Utilized laser-cooled Rubidium-87 atoms as the storage medium.
- Employed an intense control light in a coherent state to create an EIT medium.
- Incident a 930 ns squeezed vacuum pulse and manipulated its interaction with the atomic ensemble.
- Stored the pulse by switching off the control light and retrieved it by reintroducing the control light.
Main Results:
- Successfully demonstrated the storage of a squeezed vacuum pulse within the cold atomic ensemble.
- Achieved retrieval of the stored squeezed vacuum pulse after a storage time of 3 microseconds.
- Confirmed the retrieval using the time-domain homodyne detection method.
Conclusions:
- EIT in cold atomic ensembles provides a viable platform for quantum memory of squeezed vacuum states.
- This demonstration is a significant step towards building quantum networks and advanced quantum technologies.
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