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Systems and methods for obtaining information on a key in BB84 protocol of quantum key distribution

Patent image
CCDC ARL

Systems and methods for obtaining information on a key in the BB84 (Bennett-Brassard 1984) protocol of quantum key distribution are provided. A representative system comprises a quantum cryptographic entangling probe, comprising a single-photon source configured to produce a probe photon, a polarization filter configured to determine an initial probe photon polarization state for a set error rate induced by the quantum cryptographic entangling probe, a quantum controlled-NOT (CNOT) gate configured to provide entanglement of a signal with the probe photon polarization state and produce a gated probe photon so as to obtain information on a key, a Wollaston prism configured to separate the gated probe photon with polarization correlated to a signal measured by a receiver, and two single-photon photodetectors configured to measure the polarization state of the gated probe photon.

Inventors: 
Brandt, Howard E.
Patent Number: 
Technical domain: 
Communications
FIle Date: 
2005-09-26
Grant Date: 
2011-04-05
Grant time: 
2,017 days
Grant time percentile rank: 
37
Claim count percentile rank: 
6
Citations percentile rank: 
2
'Cited by' percentile rank: 
1
Assignee: 
US ARMY