Quantum state engineering with ququarts: Application for deterministic QKD protocolA. P. Shurupov1, S. S. Straupe1, S. P. Kulik1, M. Gharib2 and M. R. B. Wahiddin2, 3
1 Faculty of Physics, Moscow State University - Russia
2 International Islamic University Malaysia - Kuala Lumpur, Malaysia
3 MIMOS Berhad - Kuala Lumpusr, Malaysia
received 3 April 2009; accepted in final form 25 June 2009; published July 2009
published online 24 July 2009
We discuss the proof-of-principle demonstration of the extended deterministic Quantum Key Distribution (QKD) protocol based on ququarts. The experimental realization is based on the polarization degrees of freedom of two-mode biphotons, making the process of state preparation, transformation and measurement rather simple. The scheme uses only single nonlinear crystal for biphoton generation and linear optical elements for their following transformation and can be used as a base for further practical applications.
03.67.Dd - Quantum cryptography and communication security.
42.50.Dv - Quantum state engineering and measurements.
03.67.Hk - Quantum communication.
© EPLA 2009