Quantum Information Processing

, Volume 13, Issue 1, pp 59–70 | Cite as

The quantum cryptographic switch

  • N. Srinatha
  • S. Omkar
  • R. Srikanth
  • Subhashish Banerjee
  • Anirban PathakEmail author


We illustrate the principle of a cryptographic switch for a quantum scenario, in which a third party (Charlie) can control to a continuously varying degree the amount of information the receiver (Bob) receives, after the sender (Alice) has sent her information through a quantum channel. Suppose Charlie transmits a Bell state to Alice and Bob. Alice uses dense coding to transmit two bits to Bob. Only if the 2-bit information corresponding to the choice of the Bell state is made available by Charlie to Bob can the latter recover Alice’s information. By varying the amount of information Charlie gives, he can continuously alter the information recovered by Bob. The performance of the protocol as subjected to the squeezed generalized amplitude damping channel is considered. We also present a number of practical situations where a cryptographic switch would be of use.


Quantum communication Quantum cryptography Secure communication 


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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • N. Srinatha
    • 1
  • S. Omkar
    • 1
  • R. Srikanth
    • 1
    • 2
  • Subhashish Banerjee
    • 3
  • Anirban Pathak
    • 4
    • 5
    Email author
  1. 1.Poornaprajna Institute of Scientific ResearchBengaluruIndia
  2. 2.Raman Research InstituteBengaluruIndia
  3. 3.Indian Institute of Technology RajasthanJodhpurIndia
  4. 4.Jaypee Institute of Information TechnologyNoidaIndia
  5. 5.RCPTM, Joint Laboratory of Optics of Palacky University and Institute of Physics of Academy of Science of the Czech Republic, Faculty of SciencePalacky UniversityOlomoucCzech Republic

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