qutools quED - Table of Contents

2 quED Manual www.qutools.com
Index
Introduction and General System Description ............................................................................................3
Basic Principles of Operation ........................................................................................................................... 4
Description ................................................................................................................................................................ 7
Unpacking and Installation ................................................................................................................................. 10
Contents of Boxes .............................................................................................................................................. 10
Installation ............................................................................................................................................................. 11
Operation ...................................................................................................................................................................... 12
Laser Safety ............................................................................................................................................................ 12
Additional Warnings ......................................................................................................................................... 13
Switching On ......................................................................................................................................................... 14
Improving the Coupling .................................................................................................................................. 15
3.4.1 Operation of mirror mounts ............................................................................................................... 15
3.4.2 Realignment of the setup .................................................................................................................... 16
3.4.3 Full Alignment Procedure ..................................................................................................................... 17
Checking the Entanglement Quality (quick procedure) ................................................................. 19
Troubleshooting ........................................................................................................................................................ 20
Improving the Entanglement Quality ...................................................................................................... 20
High single count rates but very view coincidences ........................................................................ 23
4.2.1 There is polarization contrast in both arms ............................................................................... 23
There is no polarization contrast in at least one arm ..................................................................... 23
Experiments with the quED ................................................................................................................................ 24
Measurement of correlation curves ......................................................................................................... 25
Bell state discrimination ................................................................................................................................. 26
Bell experiment .................................................................................................................................................... 26
Tomographic reconstruction of the two-photon density matrix ............................................. 29