Cryptography Reference
In-Depth Information
chapter 3
Advanced Quantum
Communications
Experiments with
Entangled Photons
M. Aspelmeyer and A. Zeilinger
University of Vienna and
Austrian Academy of Sciences
H. R. B ohm, A. Fedrizzi, S. Gasparoni
∗
,
M. Lindenthal, G. Molina-Terriza
∗∗
, A. Poppe,
K. Resch
∗∗∗
, R. Ursin and P. Walther
University of Vienna
T.D. Jennewein
Austrian Academy of Sciences
Contents
3.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.2
Advanced Quantum Communication Schemes . . . . . . . . . . . . . . . . . . . . . . . 47
3.2.1
Scalable Teleportation and Entanglement
Swapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3.2.1.1
Entanglement Swapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.2.1.2
Scalable Teleportation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.2.1.3
Long-Distance Quantum Teleportation . . . . . . . . . . . . . 51
3.2.2
Purifying Quantum Entanglement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
3.2.3
A Photonic Controlled NOT Gate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
∗
Present address: Center for Biomedical Engineering and Physics, Medical University
of Vienna, Austria
∗∗
Present address: ICFO — Institut de Ciencies Fot oniques, Barcelona, Spain
∗∗∗
Present address: Department of Physics, University of Queensland, Brisbane,
Australia
