Cryptography – Communication system using cryptography – Symmetric key cryptography
Reexamination Certificate
2011-04-05
2011-04-05
Arani, Taghi T. (Department: 2438)
Cryptography
Communication system using cryptography
Symmetric key cryptography
C380S283000, C356S451000, C356S453000, C359S107000, C359S108000
Reexamination Certificate
active
07920704
ABSTRACT:
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.
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Anderson Lawrence E.
Arani Taghi T.
Kalb Alan I.
Lane Gregory
Stolarun Edward L.
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