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1. (WO2017168032) BELL STATE MEASUREMENT

Pub. No.:    WO/2017/168032    International Application No.:    PCT/FI2016/050191
Publication Date: Fri Oct 06 01:59:59 CEST 2017 International Filing Date: Wed Mar 30 01:59:59 CEST 2016
IPC: H04B 10/70
H04L 9/08
G02F 1/21
Applicants: NOKIA TECHNOLOGIES OY
Inventors: BITAULD, David
MARTIN LOPEZ, Enrique
Title: BELL STATE MEASUREMENT
Abstract:
According to an example aspect of the present invention, there is provided an apparatus comprising a first and a second polarization beam splitter-rotator (140, 142), together arranged to split two incoming polarization encoded qubits into four first optical modes, the apparatus being configured to align polarizations of the four first optical modes, an interferometer stage (150) configured to obtain, from the four first optical modes, four second optical modes, and four detectors (160) arranged to receive at least one of the four second optical modes.