Quantum process tomography of a controlled-NOT gate.

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 a maximum-likelihood estimation to convert the experimental data into a physical process matrix. The process matrix allows an accurate prediction of the operation of the gate for arbitrary input states and a 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.

• Publication year

  2004

• Venue

  Physical Review Letters

• Publication date

  2004-02-23

• Fields of study

  Medicine, Physics

• Identifiers
  DOI 10.1103/PhysRevLett.93.080502arXiv quant-ph/0402166PMID 15447165
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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