Experimental characterization of a telecommunications-band quantum controlled-not gate

Monika Patel*, Joseph B. Altepeter, Matthew A. Hall, Milja Medic, Prem Kumar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The quantum controlled-not gate is an example of the maximally entangling gate, which is a broad class of operations that are necessary for scalable linear optics quantum computation. Here, we characterize a telecommunications- wavelength (1550 nm) quantum controlled- not gate, and for the first time, experimentally bound its process fidelity by measuring its operation in two complementary polarization bases. The gates final process fidelity F is given by 91% ≤ F ≤ 95%.

Original languageEnglish (US)
Article number5325885
Pages (from-to)1685-1693
Number of pages9
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number6
StatePublished - Nov 2009


  • Controlled-not (cnot)
  • Entangling gate
  • Process tomography

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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