Quantum Cryptography

During our work on our QKD projects we have put together a software package available under a open source licence. The purpose of the software is:

  1. read quantum bits from a detector emplyong an FPGA
  2. extract the sifted key from the raw key
  3. employ (classical) error correction on the sifted key
  4. employ (classical) privacy amplification

The package (1) is based on public domain software by Opens external link in new windowPolyakov.

The package (3) is based on the LDPC codes (Opens external link in new windowLow Density Parity Check codes) by Neal and (4) uses Toeplitz matrices.

The Technical Report (Initiates file downloadavailable here) describes the parts (3) and (4) in more detail. The software was put together within the framework of a Bachelor Thesis by Pascal Notz.

The whole package is under a open source license and can be downloaded on gitHub (see Documentation for Link).


Prof. Dr. Thomas Walther

Laser und Quantenoptik
Institut für Angewandte Physik
Fachbereich 05 - Physik
Technische Universität Darmstadt
Schlossgartenstr. 7
D-64289 Darmstadt

+49 6151 16-20831 (Sekretariat)

+49 6151 16-20834 (Fax)




Saturday Morning Physics

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