Experimental demonstration of direct secure communication with 2-qubit states

Author

Schulz, O. ; Beige, Almut ; Kurtsiefer, Christian ; Weinfurter, Harald

Author_Institution

Sekt. Phys., Ludwig-Maximilians-Univ., Munchen, Germany

fYear

2003

fDate

22-27 June 2003

Firstpage

423

Abstract

Single photons are used as carriers for the experimental realization of 2-qubit states. One qubit is encoded in the photon´s polarisation, the other one in its time of arrival or its spatial mode. It is therefore possible to prepare and analyse the desired states just with linear optical components. The preparation of a polarisation-time-entangled Φ⁺-state is done with an asymmetric Mach-Zehnder-Interferometer (MZI) with polarising beamsplitters (PBS). With a subsequent polarisation rotation all eight basis states can be prepared.

Keywords

Mach-Zehnder interferometers; encoding; optical beam splitters; optical polarisers; quantum computing; quantum cryptography; quantum entanglement; telecommunication security; 2-qubit states; asymmetric Mach-Zehnder-Interferometer; basis states; direct secure communication; photon polarisation; polarisation-time-entangled Φ⁺-state; polarising beamsplitters; single photons; spatial mode; Density measurement; Educational institutions; Entropy; Heart; Information theory; Particle measurements; Protocols; Quantum entanglement; Quantum mechanics; Registers;

fLanguage

English

Publisher

ieee

Conference_Titel

Quantum Electronics Conference, 2003. EQEC '03. European

Print_ISBN

0-7803-7733-8

Type

conf

DOI

10.1109/EQEC.2003.1314281

Filename

1314281