Demonstration of a quantum controlled-NOT gate in the telecommunications band

Jun Chen*, Joseph B. Altepeter, Milja Medic, Kim Fook Lee, Burc Gokden, Robert H. Hadfield, Sae Woo Nam, Prem Kumar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

82 Scopus citations


We present the first quantum controlled-not (cnot) gate realized using a fiber-based indistinguishable photon-pair source in the 1.55 m telecommunications band. Using this free-space cnot gate, all four Bell states are produced and fully characterized by performing quantum-state tomography, demonstrating the gates unambiguous entangling capability and high fidelity. Telecom-band operation makes this cnot gate particularly suitable for quantum-information-processing tasks that are at the interface of quantum communication and linear optical quantum computing.

Original languageEnglish (US)
Article number133603
JournalPhysical review letters
Issue number13
StatePublished - Apr 4 2008

ASJC Scopus subject areas

  • General Physics and Astronomy


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