Accession Number : ADA631655


Title :   Information on a Photon: Free-Space Quantum Communication (InPho: FSQC)


Descriptive Note : Final rept. 12 Aug 2010-30 Jun 2014


Corporate Author : DUKE UNIV DURHAM NC


Personal Author(s) : Gauthier, Daniel J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a631655.pdf


Report Date : 06 Oct 2015


Pagination or Media Count : 100


Abstract : The investigators are developing a free-space quantum communication system that improves both the photon efficiency (long term goal of 10 bits per photon) and communication rate (long term goal of 1 Gbit/s). To achieve these worldrecord results, the system will rely on hyperentanglement in which multiple degrees of freedom (polarization and time/frequency) of the photon are entangled to transmit multiple secret bits per photon and independent communication channels using the transverse spatial degree of freedom will be used to achieve high communication rates. The investigators have achieved a spatial heralding efficiency of 90% in the hyperentangled source, distributed a quantum key with 8.3 bits/photon at a rate of 67 kbit/s and 2.2 bits/photon at a rate of 12.6 Mbits/s in a single channel, a source brightness of over 100 million photons/s into a single mode, developed single photon counting detectors with greater than 80% quantum efficiency and jitter 120 ps and explored methods for reducing detector after pulsing, evaluated commercial time taggers for the system, devised an improved error correction protocol, improved the performance of a sorter for orbital angular momentum modes, developed a method for arbitrary sorting of spatial modes, assessed the strength of atmospheric turbulence over a 1 km horizontal path, assessed multi-pixel detectors for single-photon counting, and developed new method for securing time bin quantum states.


Descriptors :   *OPTICAL COMMUNICATIONS , *QUANTUM ELECTRONICS , ANGULAR MOMENTUM , ATMOSPHERIC MOTION , COMMUNICATION AND RADIO SYSTEMS , ENTROPY , HILBERT SPACE , NANOWIRES , PHOTONS , POLARIZATION , SPATIAL DISTRIBUTION , SPECTRUM ANALYZERS , SUPERCONDUCTORS


Subject Categories : Nuclear Physics & Elementary Particle Physics
      Quantum Theory and Relativity
      Non-radio Communications


Distribution Statement : APPROVED FOR PUBLIC RELEASE