| Examples |
| Student’s laboratory setup “Exploring entanglement”: |
This system consists of the source of entangled photon pairs and only the minimum extra equipment to prove the extraordinary non-local laws only possible due to entanglement:
EPRSyst405 – LCLP-4mm-ManC-DetENT-LDLC-No-No-Vienna
| Student’s laboratory setup “EPR-photon pair source for QKD”: |
A full view to all correlation events important for QKD, which are generated by entangled photon pairs, is given. Optical fibre induced effects (e.g. polarization rotation) needs to be manually compensated to yield a low number of unexpected pair events.
EPRSyst405 – HCLP-4mm-ManC-DetQKD-FPGA-LOnePC-No-Vienna
Polarization entanglement is generated and analyzed by typical BB84-converters. The polarization rotation and the phase are critical and the fibre effects must be restored by polarization rotators to yield correlated detection events. For both arms, all the count rates for the polarization axes H, V, +45° and -45° are displayed as well as the number of coincidences. Further alignment of the source as well as the polarization rotation is possible to yield a low potential QBER that is calculated by taking the number of correlations into account.
| Laboratory full QKD-Demo “Secret key distillation with entangled photons” |
All necessary components for QKD are implemented on one PC hosting the QKD-stack and data acquisition. Developments of new protocols (e.g. error correction routines) can be directly implemented due to the clear architecture with corresponding interfaces.
EPRSyst405 – HCLP-4mm-AutoC-Two4BB84-OneTT8-OneLinPC-QKD-Vienna
The entangled photon pairs generate correlated features in the corresponding BB84-modules and the photons take different paths according to the measurement results. Subsequently the detection events of both sides need to be time-stamped and these data are handed to the sifting procedure. All the QKD-protocol for both parties is executed locally and this test system is a usable tool for experiments and to prove theoretical methods as well.
| Full QKD-setup “Entanglement based QKD, secret key for Alice and Bob” |
Two distant parties receive photons (800nm-fiber or free-space path) and distil a secret key out of the detection events. All needed equipment is included.
EPRSyst405 – HCHP-4mm-AutoC-Two4BB4-TwoTT8-TwoLinPC-QKD-Vienna
andreas.poppe@ait.ac.at