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Q: Fachverband Quantenoptik und Photonik
Q 48: Quanteninformation (Quantenkommunikation)
Q 48.10: Talk
Thursday, March 13, 2008, 18:45–19:00, 1B
Experimental aspects of deterministic secure quantum key distribution — •Nino Walenta1, Dietmar Korn1, Dirk Puhlmann1, Timo Felbinger1, Kim Boström2, Holger Hoffmann1, and Martin Ostermeyer1 — 1Universität Potsdam, Institut für Physik, 14469 Potsdam — 2Universität Münster, 48149 Münster
Most common protocols for quantum key distribution (QKD) use non-deterministic algorithms to establish a shared key. But deterministic implementations can allow for higher net key transfer rates and eavesdropping detection rates. The Ping-Pong coding scheme by Boström and Felbinger [1] employs deterministic information encoding in entangled states with its characteristic quantum channel from Bob to Alice and back to Bob.
Based on a table-top implementation of this protocol [2] with polarization-entangled photons fundamental advantages as well as practical issues like transmission losses, photon storage and requirements for progress towards longer transmission distances are discussed and compared to non-deterministic protocols. Modifications of common protocols towards a deterministic quantum key distribution as in [3] are addressed.
[1] K. Boström, T. Felbinger. Phys. Rev. Lett. 89 187902 (2002)
[2] M. Ostermeyer, N. Walenta. arXiv:quant-ph/0703242v1
[3] M. Lucamarini, J. S. Shaari, M.R.B. Wahiddin. arXiv:0707.3913v1