Secure communications with low-orbit spacecraft using quantum cr

Details Secure communications with low-orbit spacecraft using quantum cr Secure communications with low-orbit spacecraft using quantum cr

1997-05-20

1999-10-12

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

380 21, 380 44, 380 46, H04B 1022, H04L 900

Patent

active

059662247

ABSTRACT:
Apparatus and method for secure communication between an earth station and spacecraft. A laser outputs single pulses that are split into preceding bright pulses and delayed attenuated pulses, and polarized. A Pockels cell changes the polarization of the polarized delayed attenuated pulses according to a string of random numbers, a first polarization representing a "1," and a second polarization representing a "0." At the receiving station, a beamsplitter randomly directs the preceding bright pulses and the polarized delayed attenuated pulses onto longer and shorter paths, both terminating in a beamsplitter which directs the preceding bright pulses and a first portion of the polarized delayed attenuated pulses to a first detector, and a second portion of the polarized delayed attenuated pulses to a second detector to generate a key for secure communication between the earth station and the spacecraft.

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