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Universal Compressive Characterization of Quantum Dynamics.

Yosep Kim1, Yong Siah Teo2, Daekun Ahn2

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This summary is machine-generated.

We developed a new quantum process characterization technique that uses significantly fewer measurements. This adaptive diagonal-element-probing compression method is efficient and robust for quantum technologies.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Measurement

Background:

  • Quantum technologies rely on understanding complex quantum dynamics.
  • Characterizing quantum processes conventionally requires extensive measurements.
  • Developing efficient methods for quantum process tomography is crucial.

Purpose of the Study:

  • To introduce an adaptive diagonal-element-probing compression technique.
  • To enable feasible characterization of unknown quantum processes with reduced measurements.
  • To provide a generalizable method for multi-subsystem quantum devices.

Main Methods:

  • Utilizing compressive projective measurements.
  • Developing an adaptive diagonal-element-probing strategy.
  • Applying the technique to unitary gate characterization.

Main Results:

  • Demonstrated significantly fewer measurements compared to conventional methods (order O(d^2) for d-dimensional systems).
  • Showcased robustness against statistical noise through numerical analysis and experiments.
  • Validated the generalizability to arbitrary numbers of subsystems.

Conclusions:

  • The adaptive diagonal-element-probing compression technique offers a highly efficient approach.
  • This method reduces the cost of quantum process characterization.
  • The work facilitates reliable and compressive characterization of diverse quantum devices.