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Area of Science:

Optics and Photonics
Quantum Computing
Materials Science

Background:

Optical computing offers high speed and parallelism.
Photon echoes provide a mechanism for data storage and processing.
Rare-earth ion-doped solids are suitable for optical memory and processing applications.

Purpose of the Study:

To demonstrate mixed binary multiplication of numbers using spatial bit patterns.
To explore the use of backward stimulated photon echo for optical computation.
To assess the potential for high-speed data processing.

Main Methods:

Utilized backward stimulated photon echo in a rare-earth ion-doped solid.
Represented numbers as spatial bit patterns.
Employed a holographic arrangement for image convolution-correlation.

Main Results:

Successfully performed mixed binary multiplication of two or three numbers.
The photon-echo output image represents the convolution-correlation of input images.
Achieved computation speeds as fast as approximately 50 nanoseconds.

Conclusions:

Photon-echo-based optical processing enables efficient mixed binary multiplication.
The demonstrated technique is extremely fast and suitable for optical computing.
Potential for integration with temporal data processing for versatile processors.