Ultra-Dense Optical Storage — on One Photon

Researchers at the University of Rochester have made an optics breakthrough that allows them to encode an entire image's worth of data into a photon, slow the image down for storage, and then retrieve the image intact.

While the initial test image consists of only a few hundred pixels, a tremendous amount of information can be stored with the new technique.

The image, a “UR” for the University of Rochester, was made using a single pulse of light and the team can fit as many as a hundred of these pulses at once into a tiny, four-inch cell. Squeezing that much information into so small a space and retrieving it intact opens the door to optical buffering—storing information as light.

“It sort of sounds impossible, but instead of storing just ones and zeros, we're storing an entire image,” says John Howell, assistant professor of physics and leader of the team that created the device, which is revealed in today's online issue of the journal Physical Review Letters. “It's analogous to the difference between snapping a picture with a single pixel and doing it with a camera—this is like a 6-megapixel camera.”

“You can have a tremendous amount of information in a pulse of light, but normally if you try to buffer it, you can lose much of that information,” says Ryan Camacho, Howell's graduate student and lead author on the article. “We're showing it's possible to pull out an enormous amount of information with an extremely high signal-to-noise ratio even with very low light levels.”

Optical buffering is a particularly hot field right now because engineers are trying to speed up computer processing and network speeds using light, but their systems bog down when they have to convert light signals to electronic signals to store information, even for a short while.

“The parallel amount of information John has sent all at once in an image is enormous in comparison to what anyone else has done before.”

Howell's group used a completely new approach that preserves all the properties of the pulse. The buffered pulse is essentially a perfect original; there is almost no distortion, no additional diffraction, and the phase and amplitude of the original signal are all preserved. Howell is even working to demonstrate that quantum entanglement remains unscathed.

To produce the UR image, Howell simply shone a beam of light through a stencil with the U and R etched out. Anyone who has made shadow puppets knows how this works, but Howell turned down the light so much that a single photon was all that passed through the stencil.

Quantum mechanics dictates some strange things at that scale, so that bit of light could be thought of as both a particle and a wave. As a wave, it passed through all parts of the stencil at once, carrying the “shadow” of the UR with it. The pulse of light then entered a four-inch cell of cesium gas at a warm 100 degrees Celsius, where it was slowed and compressed, allowing many pulses to fit inside the small tube at the same time.

“The parallel amount of information John has sent all at once in an image is enormous in comparison to what anyone else has done before,” says Alan Willner, professor of electrical engineering at the University of Southern California and president of the IEEE Lasers and Optical Society. “To do that and be able to maintain the integrity of the signal—it's a wonderful achievement.”

Howell has so far been able to delay light pulses 100 nanoseconds and compress them to 1 percent of their original length. He is now working toward delaying dozens of pulses for as long as several milliseconds, and as many as 10,000 pulses for up to a nanosecond.

“Now I want to see if we can delay something almost permanently, even at the single photon level,” says Howell. “If we can do that, we're looking at storing incredible amounts of information in just a few photons.”

About the University of Rochester

The University of Rochester is one of the nation's leading private universities. Located in Rochester, N.Y., the University gives students exceptional opportunities for interdisciplinary study and close collaboration with faculty through its unique cluster-based curriculum. Its College of Arts, Sciences, and Engineering is complemented by the Eastman School of Music, Simon School of Business, Warner School of Education, Laboratory for Laser Energetics, and Schools of Medicine and Nursing.

Media Contact

Jonathan Sherwood EurekAlert!

Weitere Informationen:

http://www.rochester.edu

Alle Nachrichten aus der Kategorie: Physics and Astronomy

This area deals with the fundamental laws and building blocks of nature and how they interact, the properties and the behavior of matter, and research into space and time and their structures.

innovations-report provides in-depth reports and articles on subjects such as astrophysics, laser technologies, nuclear, quantum, particle and solid-state physics, nanotechnologies, planetary research and findings (Mars, Venus) and developments related to the Hubble Telescope.

Zurück zur Startseite

Kommentare (0)

Schreib Kommentar

Neueste Beiträge

Cyanobacteria: Small Candidates …

… as Great Hopes for Medicine and Biotechnology In the coming years, scientists at the Chair of Technical Biochemistry at TU Dresden will work on the genomic investigation of previously…

Do the twist: Making two-dimensional quantum materials using curved surfaces

Scientists at the University of Wisconsin-Madison have discovered a way to control the growth of twisting, microscopic spirals of materials just one atom thick. The continuously twisting stacks of two-dimensional…

Big-hearted corvids

Social life as a driving factor of birds’ generosity. Ravens, crows, magpies and their relatives are known for their exceptional intelligence, which allows them to solve complex problems, use tools…

By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

Close