NAIST PATENT SEARCH SYSTEM   
日本語
     
 
NAIST Application NoP05-61



TitleQUANTUM ENCRYPTION COMMUNICATION METHOD
INVENTORMURAKAMI, Yumiko; (JP).NAKANISHI, Masaki; (JP).YAMASHITA, Shigeru; (JP).
Pub.NoWO/2007/105352Pub Date20.09.2007
International Application NoPCT/JP2007/000086International Application Date 15.02.2007

abstractA sender (1) adds a decoy photon to a secret photon with secret information, carries out different rotation operations for the photons, and then transmit them to a quantum communication path (3) (S11, S12). A receiver (2) receives the photons, obtains position information of the decoy from the sender (1) through a classical communication path (4); carries out different rotation operations for the decoy and the secret photon using the obtained position information, respectively; change their order; and transmits the same (S13, S14). The sender (1) obtains information of the decoy position and operation amounts from the receiver (2), decodes the decoy; judges no interceptor (5) if a quantum state is consistent with an initial quantum state (S15, S16); and transmits a secret photon in which only encryption coded by itself at the step (S12) is decrypted (S17). The receiver (2) decrypts the encryption made by itself at the step (S13) to obtain the secret information (S18). Thus, not only classical information such as key information but also quantum information can be sent safely. In addition, the detection of an interceptor can be made effectively.
National PhaseJP 11.06.2008 2008504980 / US 02.09.2008 12224625 (Published: 01.01.2009)