Allan Goff’s Entanglements

The April issue of the IEEE Transactions on Information Theory  will publish an article by Jan-Ake Larsson claiming current commercial quantum cryptograph is vulnerable.

Bruce Schneier agrees.  

The Swedes went looking in just the right place for a vulnerability, according to Bruce Schneier, an expert in cryptography and chief technology officer at BT Counterpane, in Santa Clara, Calif. “Authentication has always been a problem with quantum crypto,” he says.

Hat Tip: Quantum City

arXiv

The team used a 1.5 metre telescope called the Matera Laser Ranging Observatory in Italy to bounce single photons off the Ajisai geodetic satellite, an orbiting disco ball that is used for laser ranging measurements.

This is very encouraging to me. Every experiment I think of to test space like causality, requires entangled photons to travel great distances.

Hat tip: slashdot.

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