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Researchers unite to distribute quantum keys
Computer securityResearchers from across Europe have united to build the largest quantum key distribution network ever built. The efforts of 41 research and industrial organisations were realised as secure, quantum encrypted information was sent over an eight node, mesh network.
 
Physicists Find Way to Control Individual Bits in Quantum Computers
A great challenge in creating a working quantum computer is maintaining control over ... find intractable – such as breaking complex cryptographic codes. ...

In the original BB84 protocol by Bennett and Brassard, an eavesdropper is detected because his attempts to intercept information result in a quantum bit error rate (QBER) of at least 25%. Here we design an alternative quantum key distribution protocol, where Alice and Bob use two mutually unbiased bases with one of them encoding a '0' and the other one encoding a '1'. The security of the scheme is due to a minimum index transmission error rate (ITER) introduced by an eavesdropper that increases significantly for higher-dimensional photon states. This allows for more noise in the transmission line, thereby increasing the possible distance between Alice and Bob without the need for intermediate nodes.

Quantum Physicists at UCSB have made a scientific breakthrough by controlling particles of light. (Monday, June 1, 2009) Physicists Max Hofheinz, Haohua Wang, John Martinis and Andrew Cleland trapped photons in a qubit, sometimes called an “artificial atom,” and were able to control it in order to create a superposition of states - where multiple states of photons exist simultaneously.

 

Scientists demonstrate all-fibre quantum logic (28 May 2009)                                       University of Bristol - Bristol,Avon,UK .............The only quantum technology in practical use today is quantum cryptography and is currently limited in the distance over which secure communication may ...

Quantum cryptography hits the fast lane   (18th May 2009)

Scientists at Toshiba Research Europe in Cambridge, UK, are claiming a significant step forward in the race to make quantum cryptography a practical ...previous key rates of 10 kbit/s over 20 km and 10 bit/s over 100 km were not sufficient for this purpose. The Toshiba team demonstrated a key rate of 1 Mbit/s over 20 km.

China builds world's first quantum encrypted gov't network
The new network demonstrates that China is able to put quantum cryptography to practical use, said Guo. The quantum-encrypted network will serve eight ...

Caltech physicists detect entanglement of one photon shared among ...

Physicists Produce Quantum-entangled Images (Jun. 13, 2008) 

Proposal of an eavesdropping experiment for BB84 QKD protocol with 1→3 phase-covariant quantum cloner (June 13, 08)

 
 


 
Recent Papers: 
 
Articles

Entanglement & Entanglement swapping
 
Direct Communication / Deterministic Quantum Cryptography / Device Independent Secure Quantum Communication

 
Useful links about quantum networks





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