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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Practical characterization of quantum devices without tomography.

Marcus P da Silva1, Olivier Landon-Cardinal, David Poulin

  • 1Disruptive Information Processing Technologies Group, Raytheon BBN Technologies, Cambridge, Massachusetts 02138, USA.

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|December 21, 2011
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Summary
This summary is machine-generated.

Quantum tomography requires exponential resources. New methods estimate experimental fidelity and identify best-fit descriptions with significantly reduced resource needs, enabling larger quantum device studies.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Experimental Quantum Physics

Background:

  • Quantum tomography is essential for assessing quantum device quality.
  • Current quantum tomography methods demand exponential resources, scaling poorly with system size.
  • Tomography often generates excessive data beyond the scope of typical experimental goals.

Purpose of the Study:

  • To develop resource-efficient schemes for evaluating quantum information processing (QIP).
  • To enable accurate estimation of experimental fidelity against theoretical models.
  • To identify the most suitable theoretical description for experimental data from a restricted set.

Main Methods:

  • Development of targeted experimental schemes for fidelity estimation.
  • Implementation of methods to select the best theoretical model from a reduced subset.
  • Analysis of resource requirements compared to standard quantum tomography.

Main Results:

  • Demonstrated significant resource reduction compared to full quantum tomography.
  • Showcased fidelity estimation using a number of experiments independent of system size.
  • Validated the ability to identify the best matching theoretical description efficiently.

Conclusions:

  • The developed schemes offer a substantial reduction in resource overhead for quantum device characterization.
  • System-size-independent fidelity estimation removes a key barrier for studying larger quantum systems.
  • Targeted approaches provide a more practical pathway for assessing quantum information processing quality.