Title:
量子暗号通信方法
Document Type and Number:
Japanese Patent JP5078035
Kind Code:
B2
Abstract:
A sender (1) adds decoy photons to a secret photon having confidential information, then, subjects each photon to a different rotational manipulation, and passes the photons along a quantum channel (3) (S11 and S12). A receiver (2) receives those photons and then obtains information about the position of the decoy photons from the sender (1) through a classical channel (4). Using the information, the receiver (2) subjects each of the decoy and secret photons to a different rotational manipulation and transmits the photons in a rearranged order (S13 and S14). The receiver (1) obtains information about the position and manipulation quantities of the decoy photons from the receiver (2) and decodes the decoy photons. If the quantum state of the decoys is identical to their initial quantum state, the sender (1) determines that no eavesdropper (5) should be present (S15 and S16), cancels only the encryption of the secret photon performed by himself or herself in S12, and transmits the secret photon (S17). The receiver (2) cancels the encryption of the secret photon performed by himself or herself in S13 and thereby obtains the confidential information (S18). The present method can securely send quantum information as well as classical information such as key information, and also effectively detect eavesdropping.
Inventors:
Yumiko Murakami
Masaki Nakanishi
Shigeru Yamashita
Masaki Nakanishi
Shigeru Yamashita
Application Number:
JP2008504980A
Publication Date:
November 21, 2012
Filing Date:
February 15, 2007
Export Citation:
Assignee:
Nara Institute of Science and Technology
International Classes:
H04L9/12; G02F3/00
Other References:
Kanamori, Y. et al.,A quantum no-key protocol for secure data communication,Proceedings of the 43rd annual Southeast regional conference,2005年,Vol.2,p.92-93
Hwang, W. -Y.,Quantum Key Distribution with High Loss: Toward Global Secure Communication,PHYSICAL REVIEW LETTERS,2003年 8月 1日,Vol.91 No.5,p.057901-1 -4
Hwang, W. -Y.,Quantum Key Distribution with High Loss: Toward Global Secure Communication,PHYSICAL REVIEW LETTERS,2003年 8月 1日,Vol.91 No.5,p.057901-1 -4
Attorney, Agent or Firm:
Kyoto International Patent Office
Ryouhei Kobayashi
Ryouhei Kobayashi