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Related Experiment Video

Updated: Jul 19, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor

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Published on: November 11, 2013

Phase-coherent amplification of matter waves

Kozuma¹, Suzuki, Torii

¹Institute of Physics, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan. Department of Physics, Gakushuin University, Mejiro 1-5-1, Toshima-ku, Tokyo 171-8588, Japan. Physics Lab, National Institute of Standards and Technology.

Science (New York, N.Y.)

|December 22, 1999

Summary

Researchers amplified Bose-Einstein condensate (BEC) matter waves using rubidium-87 atoms. This phase-coherent amplification, achieved via superradiance, maintains the seed wave

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Area of Science:

Quantum physics
Atomic physics
Condensed matter physics

Background:

Bose-Einstein condensates (BECs) are quantum states of matter with unique properties.
Matter-wave amplification is crucial for advancing atom optics and precision measurement technologies.
Maintaining phase coherence during amplification is a significant challenge in matter-wave manipulation.

Purpose of the Study:

To demonstrate phase-coherent amplification of matter waves using Bose-Einstein condensates.
To investigate the coherence properties of amplified matter waves.
To explore the potential of active matter-wave devices.

Main Methods:

Generation of a seed matter wave via coherent optical Bragg diffraction.
Utilizing a Bose-Einstein condensate of rubidium-87 atoms as a gain medium.
Employing the superradiance effect for matter-wave amplification.
Analysis of coherence properties using a matter-wave interferometer.

Main Results:

Successful phase-coherent amplification of a seed matter wave was achieved.
The amplified matter wave's coherence was locked to the seed wave's properties.
Demonstrated the use of a BEC as an active gain medium for matter waves.

Conclusions:

Phase-coherent matter-wave amplification is feasible using BECs and superradiance.
The developed active matter-wave device shows promise for atom optics, atom lithography, and precision measurements.
This technique preserves the coherence of the initial seed matter wave.