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Let’s Know the History of Quantum Cryptography

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Let’s Know the History of Quantum Cryptography

In the early 1970s, Stephen Weisner introduced quantum cryptography in his article "Conjugate Coding." Two scientists, Bennet and Brassard, who were familiar with Weisner's theories, were prepared to publish their own ideas by the time the proposal was published in Sigact News in 1983.


They created the "BB84," the first Quantum Cryptography protocol, in 1984. Based on this, the first experimental prototype was created in 1991. It worked over a 32-centimeter range. The technology has improved over time, and the distance has grown to kilometres. In June 2003, a team from the University of Vienna successfully sent entangled photons over free space and across the Danube River. The first quantum key-encrypted money transfer took place between two Austrian banks in April 2004.


In Cambridge, Massachusetts, there is now a functioning network of computers where communication is protected by Quantum Cryptography. The first data packets were transferred across the Quantum Net (Qnet) on Thursday by Chip Elliott, the head of BBN Technologies' Cambridge-based quantum engineering team. Defense Advanced Research Projects Agency of the Pentagon is funding the endeavour.


Although there are currently only six servers in the network, it is possible to integrate them with other internet-based servers and clients. The developers of Qnet claim that adding more nodes to banks and credit card businesses could increase the security of sensitive data exchange over the internet beyond what is now possible with existing cryptographic techniques.


The data in Qnet travels the 10 kilometres from BBN to Harvard University through regular fibre optic connections. The first network with more than two nodes to employ Quantum Cryptography, a more difficult challenge, is Qnet. In Qnet, photons are guided down the proper optical fibre using software-controlled optical switches comprised of lithium niobate crystals.

Read More- https://coherentmarketinsightsus.blogspot.com/2023/01/the-field-of-quantum-cryptography.html


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