The information of highdimensional timebin encoded photons
Abstract
Highdimensional entanglement is an important physical resource for quantum communication. A basic issue for any communication scheme is how many shared bits two parties can extract subject to experimental noise. We determine the shared information that can be extracted from timebin entangled photons using frame encoding. We consider photons generated by a general downconversion source and also model losses, dark counts and the effects of multiple photons within each frame. Furthermore, we describe a procedure for including other imperfections such as afterpulsing, detector deadtimes and jitter. The results are illustrated by deriving analytic expressions for the maximum information that can be extracted from highdimensional timebin entangled photons generated by down conversion. A key finding is that under realistic conditions and using standard SPAD detectors one can still choose the frame size so as to extract over 10 bits per photon. These results are thus useful for experiments on highdimensional quantumkey distribution systems, but are not limited to such systems. For example, the results are also useful for determining the limits of fibre arrays or within timemultiplexing schemes.
 Publication:

European Physical Journal D
 Pub Date:
 October 2016
 DOI:
 10.1140/epjd/e2016703574
 arXiv:
 arXiv:1506.04420
 Bibcode:
 2016EPJD...70..214B
 Keywords:

 Quantum Information;
 Quantum Physics
 EPrint:
 18 pages, 6 figures