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Related Experiment Videos

Implementing efficient selective quantum process tomography of superconducting quantum gates on IBM quantum

Akshay Gaikwad1, Krishna Shende1, Arvind1,2

  • 1Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Sector 81 SAS Nagar, Manauli, Punjab, 14030, India.

Scientific Reports
|March 8, 2022
PubMed
Summary

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We present a modified selective quantum process tomography (MSQPT) method to reduce experimental complexity. This approach simplifies the characterization of quantum gates, making quantum process tomography more accessible.

Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Information Processing

Background:

  • Selective Quantum Process Tomography (SQPT) requires numerous experimental settings for precise quantum gate characterization.
  • Preparing quantum 2-design states for SQPT is experimentally demanding, hindering practical implementation.

Purpose of the Study:

  • To reduce the experimental complexity of SQPT.
  • To develop a more efficient method for characterizing quantum gates.

Main Methods:

  • Mathematically reformulated SQPT into a Modified SQPT (MSQPT) method.
  • Designed a generalized quantum circuit for preparing input states.
  • Formulated an efficient measurement strategy to minimize experimental cost.

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Main Results:

  • Successfully demonstrated the MSQPT protocol experimentally.
  • Selectively characterized various two- and three-qubit quantum gates.
  • Reduced the experimental overhead compared to standard SQPT.

Conclusions:

  • The MSQPT method offers a more practical and efficient approach to quantum process tomography.
  • This work paves the way for more accessible experimental characterization of quantum gates.