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

Research output: Contribution to journalArticlepeer-review

83 Citations (Scopus)


We present the first quantum controlled-not (CNOT) gate realized using a fiber-based indistinguishable photon-pair source in the 1.55 mu 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 gate's 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. © 2008 The American Physical Society

Original languageEnglish
Article number133603
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Issue number13
Publication statusPublished - 4 Apr 2008


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