Accession Number:



Quantum Communication Using Macroscopic Phase Entangled States

Descriptive Note:

[Technical Report, Final Report]

Corporate Author:

University of Maryland at Baltimore County

Personal Author(s):

Report Date:


Pagination or Media Count:



This final report describes the accomplishments of the program after 36 months of funding. A new long-range QKD protocol was proposed and its security was investigated. A pulsed Sagnac interferometer for single-shot phase shift measurements was investigated but not completed due to technical difficulties. Other methods for producing single-photon nonlinear phase shifts were investigated. Randomly-chosen unitary transformations were used to decrease the mutual information available to an eavesdropper. Several nonlinear effects were demonstrated using metastable xenon in a high-finesse cavity, including a nonlinear cross-phase shift. The nonlinear phase shifts were enhanced. Other techniques for long-range secure quantum communications were investigated based on the use of a small amount of shared prior key.


Subject Categories:

  • Radio Communications
  • Cybernetics
  • Quantum Theory and Relativity

Distribution Statement:

[A, Approved For Public Release]