New quantum transmission protocol has higher data transmission rate, robustness against interference

Phys.org  September 22, 2021
One of the fundamental principles enabling entanglement-based quantum communication security is the fact that interfering with one photon will destroy entanglement and thus be detectable. However, this property is also the greatest obstacle. Random encounters of traveling photons, losses, and technical imperfections make noise an inevitable part of any quantum communication scheme, severely limiting distance, key rate, and environmental conditions in which quantum key distribution can be employed. Using photons entangled in their spatial degree of freedom, an international team of researchers (China, Austria, Canada, Czech Republic, Slovakia) has shown that the increased noise resistance of high-dimensional entanglement can be harnessed for practical key distribution schemes. They performed quantum key distribution in eight entangled paths at various levels of environmental noise and showed key rates that, even after error correction and privacy amplification, still exceeded 1 bit per photon pair and furthermore certified a secure key at noise levels that would prohibit comparable qubit-based schemes from working…read more. TECHNICAL ARTICLE 

Posted in Communications technology and tagged , .

Leave a Reply