Quantum process tomography of a controlled-NOT gate

Details Quantum process tomography of a controlled-NOT gate Quantum process tomography of a controlled-NOT gate

2004-02-23

arxiv.org/abs/quant-ph/0402166v2

Phys.Rev.Lett.93:080502,2004

Physics

Quantum Physics

4 pages, 2 figures. v2 contains new data corresponding to improved gate operation. Figure quality slightly reduced for arXiv

Scientific paper

10.1103/PhysRevLett.93.080502

We demonstrate complete characterization of a two-qubit entangling process - a linear optics controlled-NOT gate operating with coincident detection - by quantum process tomography. We use maximum-likelihood estimation to convert the experimental data into a physical process matrix. The process matrix allows accurate prediction of the operation of the gate for arbitrary input states, and calculation of gate performance measures such as the average gate fidelity, average purity and entangling capability of our gate, which are 0.90, 0.83 and 0.73, respectively.

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