Demonstration of a Quantum Controlled-NOT Gate in the Telecom Band

Details Demonstration of a Quantum Controlled-NOT Gate in the Telecom Band Demonstration of a Quantum Controlled-NOT Gate in the Telecom Band

2008-02-11

arxiv.org/abs/0802.1441v1

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.100.133603

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.

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