Method and apparatus for free-space quantum key distribution in daylight
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 8, 2004
Grant Date -
Dec 27, 2001
app pub date -
Apr 27, 2001
filing date -
Apr 28, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A quantum cryptography apparatus securely generates a key to be used for secure transmission between a sender and a receiver connected by an atmospheric transmission link. A first laser outputs a timing bright light pulse; other lasers output polarized optical data pulses after having been enabled by a random bit generator. Output optics transmit output light from the lasers that is received by receiving optics. A first beam splitter receives light from the receiving optics, where a received timing bright light pulse is directed to a delay circuit for establishing a timing window for receiving light from the lasers and where an optical data pulse from one of the lasers has a probability of being either transmitted by the beam splitter or reflected by the beam splitter. A first polarizer receives transmitted optical data pulses to output one data bit value and a second polarizer receives reflected optical data pulses to output a second data bit value. A computer receives pulses representing receipt of a timing bright timing pulse and the first and second data bit values, where receipt of the first and second data bit values is indexed by the bright timing pulse.
First Claim
Other Claims data not available
