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Optical modulation schemes for frequency-coded quantum key distribution

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1 Author(s)
Kumar, K.P. ; Dept. of Electr. Eng., Indian Inst. of Technol. Kanpur, Kanpur, India

We discuss possible modulation schemes to implement BB84 and B92 quantum key distribution protocols using frequency-coding method. We derive time evolution of quantum states of light in a Mach-Zehnder interferometer based optical intensity modulator. We then show that phase modulator-phase modulator (PM-PM) combination can be used to implement the B92 protocol and intensity modulator-intensity modulator (IM-IM) combination can be used to implement the BB84 protocol. However, the combinations-PM-IM or IM-PM-cannot be used to implement BB84 and B92 protocols using frequency-coding method. Finally, we discuss the security of frequency-coded implementation of B92 protocol.

Published in:

Communications (NCC), 2010 National Conference on

Date of Conference:

29-31 Jan. 2010