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Breakthrough Could Make Quantum Data Transmission a Reality

The new method eliminates the restriction of spectrum availability in wireless networks.

Researchers at the University of Ottawa in Canada have sent a quantum-secured message containing more than one bit of information per photon through the air above a city.

Credit: Fierce Wireless

Researchers at the University of Ottawa in Canada have relayed a quantum-secured message containing multiple bits of information for each photon through the air above a city, a significant milestone in the quest to realize quantum data transmission.

"Our work is the first to send messages in a secure manner using high-dimensional quantum encryption in realistic city conditions, including turbulence," says University of Ottawa professor Ebrahim Karimi. "The secure, free-space communication scheme...could potentially link Earth with satellites, securely connect places where it is too expensive to install fiber, or be used for encrypted communication with a moving object, such as an airplane."

The team successfully demonstrated four-dimensional quantum encryption over a free-space optical network between two buildings 0.3 kilometers apart. The messages had an 11% error rate, below the 19% threshold required to maintain a secure connection. In addition, 1.6 times more information was transmitted for every photon than two-dimensional encryption.

From FierceWireless
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Abstracts Copyright © 2017 Information Inc., Bethesda, Maryland, USA


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