Large-Alphabet Quantum Key Distribution Using Spatially Encoded Light

  • Tristan Tentrup (Speaker)
  • Willemijn Luiten (Contributor)
  • Peter Hooijschuur (Contributor)
  • Reinier van der Meer (Contributor)
  • Pinkse, P. (Speaker)

Activity: Talk or presentationOral presentation


In order to transmit a secret message between a sender (Alice) and a receiver (Bob), both parties need a shared secret for encryption and decryption. Quantum Key Distribution (QKD) provides a secure way of generating such shared keys. The original BB84 protocol uses a two-dimensional polarization basis, limiting the information content of a single photon to 1 bit. Using the position of single photons as one basis and the Fourier space as second basis, one can construct a pair of mutually unbiased higher-dimensional bases. This improves not only the security of the protocol, but also the key generation rate. We present our experimental results with an encoding scheme using a Spatial Light Modulator (SLM) allowing two nearly orthogonal alphabets with in the order of 103 symbols and an information content per single photon of about 10 bit.
Period6 Mar 2017
Event titleDPG Frühjahrstagung 2017 Mainz: (DPG Spring Meeting)
Event typeConference
OrganiserDeutsche Physikalische Gesellschaft
LocationMainz, GermanyShow on map
Degree of RecognitionInternational