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Experimental demonstration of simplified quantum process tomography.

Z Wu1, S Li, W Zheng

  • 1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.

The Journal of Chemical Physics
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Simplified quantum process tomography (QPT) offers a more efficient method for characterizing open quantum systems. This study validates a simplified QPT approach using NMR quantum simulation, showing improved scalability compared to standard QPT.

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Area of Science:

  • Quantum Information Science
  • Quantum Dynamics
  • Quantum Simulation

Background:

  • Characterizing open quantum systems is crucial for understanding quantum dynamics.
  • Standard quantum process tomography (QPT) is essential but faces scalability challenges.
  • A simplified QPT approach exists when system and system-environment Hamiltonians commute.

Purpose of the Study:

  • To experimentally demonstrate and validate a simplified quantum process tomography (QPT) method.
  • To compare the efficiency and scalability of simplified QPT against standard QPT.
  • To simulate dephasing channels in an open quantum system using a nuclear magnetic resonance (NMR) quantum simulator.

Main Methods:

  • Utilized a nuclear magnetic resonance (NMR) quantum simulator.
  • Experimentally simulated dephasing channels.
  • Performed both simplified and standard quantum process tomography (QPT) for comparison.

Main Results:

  • Experimental results successfully validated the simplified quantum process tomography (QPT) approach.
  • The simplified QPT method demonstrated greater efficiency and scalability.
  • Observed good agreement between experimental outcomes and theoretical predictions.

Conclusions:

  • The simplified QPT method is a valid and more efficient tool for characterizing open quantum system dynamics.
  • Prior knowledge of commuting Hamiltonians significantly enhances QPT scalability.
  • NMR quantum simulation provides a robust platform for validating quantum information protocols.