Ait Austrian Institute of Technology Gmbh

Austrian Research Centers Gmbh-arc

Max-planck-gesellschaft Zur F&#xf6;rderung Der Wissenschaften E. V.

Huawei Technologies Duesseldorf Gmbh

Christoph Pacher

Bernhard Schrenk

Fred Chi Hang Fung

Stephan Krenn

Gerd Leuchs

Norman Finger

Thomas Loruesner

Christoph Marquardt

Imran Khan

Winfried Boxleitner

Thomas LORÜNSER

Momtchil Peev

A method creates and distributes cryptographic keys for securing communication at two terminals. Signals for creating correlated values in the two terminals are distributed via a first communication channel burdened with error, and the correlated values are present as keys. A checksum is formed on the basis of the first key present in the first terminal and the checksum is transferred to the second terminal via a second communication channel. A second checksum is formed on the basis of the second key present, and information derived from the two checksums is transferred via the second communication channel to a server. Based on the information derived from the checksums, the server determines a correction value, which, when applied to one or both keys, brings the keys into correspondence. The correction value is transferred to one or both terminals via the second communication channel and is applied to one or both keys.

Method for creating and distributing cryptographic keys

A device for generating polarization-entangled photons by means of parametric down-conversion, comprising a waveguide structure formed in a substrate of an optically non-linear material with periodically poled regions, wherein, when in operation, pump photons can be supplied from a pump laser to the waveguide structure, and wherein a separating means for separating the entangled photons for the separate further conduction of signal photons and idler photons, respectively, is arranged to follow the waveguide structure.

Device for generating polarization-entangled photons

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Vienna, Austria

Christoph Pacher