Quantum cryptography transmission method and system

Details Quantum cryptography transmission method and system Quantum cryptography transmission method and system

2007-11-20

2007-11-20

Barron, Gilberto (Department: 2132)

Cryptography

Communication system using cryptography

Fiber optic network

Reexamination Certificate

active

10416187

ABSTRACT:
Quantum cryptography by polarization ambiguity is generally used but it involves polarization-maintained fibers. This invention proposes an alternative: quantum cryptography by ambiguity in time. It comprises the conversion of K bits to be transmitted into a train of K pulses of particle flows of time width ΔT and whose frequency Tb, is predetermined knowing that each of the K pulses being shifted or not in time such that the kthpulse is shifted by a duration t0respectively t1, with respect to the initial instant of the period depending on the value “0”, respectively “1” of the kthbit, where k is an integer such that 0≦k<K and the shifts t0and t1are such that 0≦t0,t1≦Tb−ΔT and 0<|t1−t0|<ΔT.

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