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Related Experiment Videos

Quantum process tomography of a controlled-NOT gate.

J L O'Brien1, G J Pryde, A Gilchrist

  • 1Centre for Quantum Computer Technology and Physics Department, University of Queensland, Brisbane 4072, Australia.

Physical Review Letters
|September 28, 2004
PubMed
Summary

We fully characterized a two-qubit controlled-NOT gate using quantum process tomography. This method accurately predicts gate performance, achieving high fidelity and entangling capability.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Linear Optics

Background:

  • Accurate characterization of quantum gates is crucial for building reliable quantum computers.
  • Quantum process tomography (QPT) is a standard technique for quantifying quantum operations.

Purpose of the Study:

  • To demonstrate complete characterization of a two-qubit entangling gate.
  • To utilize quantum process tomography for analyzing a linear optics controlled-NOT gate.

Main Methods:

  • Employed quantum process tomography (QPT) for comprehensive gate analysis.
  • Utilized maximum-likelihood estimation to reconstruct the physical process matrix from experimental data.
  • Implemented a linear optics controlled-NOT gate with coincident detection.

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Main Results:

  • Achieved a high average gate fidelity of 0.90.
  • Obtained an average purity of 0.73.
  • Quantified the entangling capability of the gate as 0.73.

Conclusions:

  • The developed quantum process tomography method provides a complete characterization of the two-qubit gate.
  • The process matrix enables accurate prediction of gate operation for any input state.
  • The gate exhibits promising performance metrics for quantum information processing applications.