On Quantum Cryptography and Secure Data Communication
This work contrasts quantum information theory  and cryptography with the disciplines of steganog-
raphy, traﬃc security and classical cryptosystems as applied towards discreet communication. In quantum
computing, the laws of physics protect the information using the properties of quantum mechanics. Open-
air quantum key distribution with single photon source (SPS) has been demonstrated in experimental
conditions [2, 3, 4]. In the area of Quantum Cryptography, in particular, it has been shown that there
are intrinsic properties in Quantum Mechanics that will enable a Quantum Computer to produce results
not possible with a classical computer [5, 6, 7].
In this paper we investigate the concept of development of Internet technologies based on the quantum
principles  of cryptography, secret sharing and teleportation. In particular, this paper is intended as
an introduction to the possibility of quantum optics giving birth to a new generation of communication
protocols over internet. It also addresses the complications arising from the atomic level structure of
a quantum computing system such as: decoherence, entanglement, quantum teleportation , unitary
transformations, and reversible universal gate structures. In the end, an analysis of a quantum full adder
constructed from these gates is presented along with suggestions for the creation of other elementary
 Shor, P. (2000), Quantum Information Theory: Results and Open Problems. Geom. Funct. Anal.
(GAFA), Special Volume – GAFA 2000, 816-838.
 All´aume, R., Treussart, F., Messin, G., Dumeige, Y., Roch, J-F., Beveratos, A., Brouri-Tualle,
R., Poizat, J-P., and Grangier, P. (2004), Experimental open-air quantum key distribution with a
single-photon source. New Journal of Physics 6, 92.
 O’Brien, J.L. (2007), Optical Quantum Computing. Science (7 December) 318, no. 5856, 1567–1570.
 Kok, P., Munro, W.J., Nemoto, K., Ralph, T.C., Dowling, J.P. and Milburn, G.J. (2007), Linear
optical quantum computing with photonic qubits. Reviews of Modern Physics (January 2007) 79,
Issue 1, 135–174.
 Bennett, C.H., Brassard, G. and Ekert, A.K. (1992), Quantum cryptography. Scientiﬁc American,
October 1992, 50–57.
 Shor, P.W. (1994), Algorithms for quantum computation: discrete logarithms and factoring. Proceed-
ings 35th Annual Symposium on Foundations of Computer Science, 124–134.
 Bennett, C.H., Bessette, F., Brassard, G., Salvail, L. and Smolin, J. (1992), Experimental Quantum
Cryptography. Journal of Cryptology 5, no. 1, 3–28.
 Slusher, D. (2006), Lecture at ARDA. http://www.cleoconference.org/materials/slusher.pdf
 Barrett, M.D., Chiaverini, J., Schaetz, T., Britton, J., Itano, W.M., Jost, J.D., Knill, E., Langer, C.,
Leibfried, D., Ozeri, R. and Wineland, D.J. (2004), Deterministic quantum teleportation of atomic
qubits. Nature (17 June) 429, 737–739.
 Hanson, R., Kouwenhoven, L.P., Petta, J.R., Tarucha, S. and Vandersypen, L.M.K. (2007), Spins in
few-electron quantum dots. Reviews of Modern Physics (October 2007) 79, Issue 4, 1217–1265.
 Vazirani, U. (1994), Quotation from a newspaper article by Tom Siegfried, Science Editor of the
Dallas Morning News.
∗ Swisscom AG, IPSS Laboratory, Binzring 17, 8045 Zurich, Switzerland; e-mail: firstname.lastname@example.org and
alternate e-mail: email@example.com