Maryland's Defense Patent Database

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Alternative design for quantum cryptographic entangling probe

Patent image
CCDC ARL

An alternative design is given for an optimized quantum cryptographic entangling probe for attacking the BB84 protocol of quantum key distribution. The initial state of the probe has a simpler analytical dependence on the set error rate to be induced by the probe than in the earlier design. The new device yields maximum information to the probe for a full range of induced error rates. As in the earlier design, the probe contains a single CNOT gate which produces the optimum entanglement between the BB84 signal states and the correlated probe states.

Inventors: 
Brandt, Howard E.
Patent Number: 
Technical domain: 
Communications
FIle Date: 
2007-03-29
Grant Date: 
2011-01-25
Grant time: 
1,398 days
Grant time percentile rank: 
25
Claim count percentile rank: 
5
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US ARMY