Experimental demonstration of high two-photon time-energy entanglement

Irfan Ali Khan*, John C. Howell

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

73 Scopus citations


We report on the experimental demonstration of high energy-time entanglement in two-photon states created in the process of spontaneous parametric down-conversion. We show that the classical variance product, which we violate by three orders of magnitude, actually represents a lower bound estimate of the number of information eigenmodes K. Explicit measurements estimate K to be greater than 100, with theoretical estimates predicting a value of as high as 1× 106. These results provide incentive for the practical feasibility of large bandwidth quantum information processing, particularly in cryptography over large distances.

Original languageAmerican English
Article number031801
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number3
StatePublished - 2006
Externally publishedYes


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