Anton Zeilinger

Allgemein

Anton Zeilinger
Anton Zeilinger - anton.zeilinger@univie.ac.at

http://www.ap.univie.ac.at/users/Anton.Zeilinger/ 

Quantum Teleportation
Harald Weinfurter - harald.weinfurter@physik.uni-muenchen.de

Here we present the first experimental verification of quantum teleportation. By producing pairs of entangled photons by the process of parametric down-conversion and using two-photon interferometry for analysing the entanglement, we could transfer a quantum property (in our case the polarization state) from one photon to another.

http://www.quantum.univie.ac.at/research/teleport/index.html 

Diffraction and Interference with Fullerenes: Wave-particle duality of C₆₀
Markus Arndt , Olaf Nairz, Julian Voss-Andreae, Claudia Keller, Gerbrand van der Zouw, Anton Zeilinger
We have observed de Broglie wave interference of the buckminsterfullerene C₆₀ with a wavelength of about 3 pm through diffraction at a SiN_x absorption grating with 100 nm period. This molecule is the by far most complex object revealing wave behaviour so far. The buckyball is the most stable fullerene with a mass of 720 atomic units, composed of 60 tightly bound carbon atoms. 
http://www.quantum.univie.ac.at/research/c60/ 

Quantum Cryptography with Entangled Photon Pairs
Thomas Jennewein, Christoph Simon, Gregor Weihs, Harald Weinfurter, Anton Zeilinger
By realizing a quantum cryptography system based on polarization entangled photon pairs we establish highly secure keys, because a single photon source is effectively realized and the inherent randomness of quantum measurements is exploited. We implement a novel key distribution scheme using Wigner's inequality to test the security of the quantum channel, and, alternatively, realize a variant of the BB84 protocol. Our system has two completely independent users separated by 360 m, and generates raw keys at rates of 400 - 800 bits/s with bit error rates arround 3 %.
http://www.quantum.univie.ac.at/research/crypto/