Researchers demonstrate secure information transfer using spatial
correlations in quantum entangled beams of light

Date:
June 5, 2023
Source:
University of Oklahoma
Summary:
Researchers have demonstrated the principle of using spatial
correlations in quantum entangled beams of light to encode
information and enable its secure transmission.


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==========================================================================
FULL STORY ========================================================================== Researchers at the University of Oklahoma led a study recently published
in Science Advancesthat proves the principle of using spatial correlations
in quantum entangled beams of light to encode information and enable
its secure transmission.

Light can be used to encode information for high-data rate transmission,
long- distance communication and more. But for secure communication,
encoding large amounts of information in light has additional challenges
to ensure the privacy and integrity of the data being transferred.

Alberto Marino, the Ted S. Webb Presidential Professor in the Homer
L. Dodge College of Arts, led the research with OU doctoral student and
the study's first author Gaurav Nirala and co-authors Siva T. Pradyumna
and Ashok Kumar.

Marino also holds positions with OU's Center for Quantum Research and Technology and with the Quantum Science Center, Oak Ridge National
Laboratory.

"The idea behind the project is to be able to use the spatial properties
of the light to encode large amounts of information, just like how an
image contains information. However, to be able to do so in a way that is compatible with quantum networks for secure information transfer. When
you consider an image, it can be constructed by combining basic spatial patterns know as modes, and depending on how you combine these modes,
you can change the image or encoded information," Marino said.

"What we're doing here that is new and different is that we're not just
using those modes to encode information; we're using the correlations
between them," he added. "We're using the additional information on how
those modes are linked to encode the information." The researchers
used two entangled beams of light, meaning that the light waves are interconnected with correlations that are stronger than those that can
be achieved with classical light and remain interconnected despite their distance apart.

"The advantage of the approach we introduce is that you're not able to
recover the encoded information unless you perform joint measurements
of the two entangled beams," Marino said. "This has applications such
as secure communication, given that if you were to measure each beam by
itself, you would not be able to extract any information. You have to
obtain the shared information between both of the beams and combine it in
the right way to extract the encoded information." Through a series of
images and correlation measurements, the researchers demonstrated results
of successfully encoding information in these quantum- entangled beams of light. Only when the two beams were combined using the methods intended
did the information resolve into recognizable information encoded in
the form of images.

"The experimental result describes how one can transfer spatial patterns
from one optical field to two new optical fields generated using a quantum mechanical process called four-wave mixing," said Nirala. "The encoded
spatial pattern can be retrieved solely by joint measurements of generated fields. One interesting aspect of this experiment is that it offers a
novel method of encoding information in light by modifying the correlation between various spatial modes without impacting time-correlations."
"What this could enable, in principle, is the ability to securely encode
and transmit a lot of information using the spatial properties of the
light, just like how an image contains a lot more information than
just turning the light on and off," Marino said. "Using the spatial correlations is a new approach to encode information." "Information
encoding in the spatial correlations of entangled twin beams" was
published in Science Advances on June 2, 2023.

* RELATED_TOPICS
o Matter_&_Energy
# Optics # Quantum_Computing # Quantum_Physics # Physics
o Computers_&_Math
# Quantum_Computers # Information_Technology # Encryption
# Hacking
* RELATED_TERMS
o Quantum_entanglement o Quantum_computer o
Wave-particle_duality o Schro"dinger's_cat o Linus_Pauling o
Quantum_dot o Quantum_number o Uncertainty_principle

========================================================================== Story Source: Materials provided by University_of_Oklahoma. Original
written by Chelsea Julian. Note: Content may be edited for style and
length.


========================================================================== Journal Reference:
1. Gaurav Nirala, Siva T. Pradyumna, Ashok Kumar, Alberto M. Marino.

Information encoding in the spatial correlations of entangled
twin beams.

Science Advances, 2023; 9 (22) DOI: 10.1126/sciadv.adf9161 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2023/06/230605181236.htm

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