Secret key distribution method and secret key distribution system
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United States of America Patent
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Feb 17, 2009
Grant Date -
May 26, 2005
app pub date -
Oct 29, 2004
filing date -
Oct 30, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
In the method of the present invention, one of each pair of photons connected through entanglement is distributed to a transmitting station, relay stations and a receiving station. After the photons reach secure sites, such as the relay stations, a base for detecting photons is determined between adjacent sites, and then photons are detected in each site, which makes it possible to obtain a secret key used for secure information transmission between relay stations using bases coincide with each other every time. Also, in the present invention, a high-quality random number sequence serving as a secret key is automatically generated in a physical manner every time by detecting a superposition state of an entanglement and procedures corresponding to those in which a secret key itself is transmitted in a form of a quantum cryptogram are performed.
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