www.qutools.com quED Manual 3
Introduction and General System Description
The quED is a complete system for the generation and analysis of polarization-entangled
photon pairs. In its basic version the quED delivers the coincidence counting rate of above 1 kHz
with at least 90% visibility of correlation curves in two complementary bases. These
parameters guarantee that the genuine two-particle entanglement can be detected and
demonstrated, e.g. via measurement of Bell inequalities, within few minutes after the start of
the system.
The heart of the quED employs a spontaneous parametric down-conversion process to
generate polarization-entangled photon pairs. Fiber coupled single photon detectors in
connection with polarizing filters are used to detect the photon pairs, analyze their polarization
and verify their non-classical polarization correlations. The quED control unit features a laser
diode driver and a multi-channel counter with integrated coincidence logic electronics, which
registers single photon detections and photon pair detections. The corresponding counting
rates are displayed on an integrated display or can be read out via a network (http://) interface.
This document contains user information for the optical unit of quED, i.e. the source of
polarization entangled photon pairs. Please read the manual carefully before operating the
source. Particular attention should be paid to the section of laser safety. For the details on
description and operation of quED control unit users are referred to the document “Down-
conversion Controller Manual”.
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