nt - p h / 06 06 07 2 v 2 3 A ug 2 00 6 Free - space quantum key distribution with entangled photons
نویسنده
چکیده
We report on a complete experimental implementation of a quantum key distribution protocol through a free space link using polarization-entangled photon pairs from a compact parametric down-conversion source. Over 10 hours of uninterrupted communication between sites 1.5 km apart, we observe average key generation rates of 630 per second after error correction and privacy amplification. Our scheme requires no specific hardware channel for synchronization apart from a classical wireless link, and no explicit random number generator.
منابع مشابه
ar X iv : q ua nt - p h / 06 05 23 2 v 1 29 M ay 2 00 6 Propagation of spatially entangled qudits through free space
We show the propagation of entangled states of high-dimensional quantum systems. The qudits states were generated using the transverse correlation of the twin photons produced by spontaneous parametric down-conversion. Their free-space distribution was performed at the laboratory scale and the propagated states maintained a high-fidelity with their original form. The use of entangled qudits all...
متن کاملnt - p h / 06 06 05 5 v 2 6 A ug 2 00 6 Schmidt number of pure continuous - variable bi - partite entangled states and methods of its calculation
An entanglement measure for pure-state continuous-variable bi-partite problem, the Schmidt number, is analytically calculated for one simple model of atom-field scattering.
متن کاملar X iv : q ua nt - p h / 06 08 19 5 v 1 2 5 A ug 2 00 6 Quantum key distribution based on arbitrary private states
Karol Horodecki, Micha l Horodecki, Pawe l Horodecki, Debbie Leung, Jonathan Oppenheim Department of Mathematics, Physics and Computer Science, University of Gdańsk, 80–952 Gdańsk, Poland Faculty of Applied Physics and Mathematics, Technical University of Gdańsk, 80–952 Gdańsk, Poland Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario, N2L1N8, Canada and Department of Ap...
متن کاملar X iv : q ua nt - p h / 05 08 06 7 v 1 8 A ug 2 00 5 NEW SCHEME OF QUANTUM TELEPORTATION
A new scheme for quantum teleportation is presented, in which the complete teleportation can be occurred even when an entangled state between Alice and Bob is not maximal.
متن کاملar X iv : q ua nt - p h / 06 08 22 9 v 1 2 9 A ug 2 00 6 Remote preparation of an atomic quantum memory
Storage and distribution of quantum information are key elements of quantum information processing and quantum communication. Here, using atom-photon entanglement as the main physical resource, we experimentally demonstrate the preparation of a distant atomic quantum memory. Applying a quantum teleportation protocol on a locally prepared state of a photonic qubit, we realized this so-called rem...
متن کامل