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Experimental Self-Characterization of Quantum Measurements.

Aonan Zhang1,2, Jie Xie1,2, Huichao Xu1,2

  • 1National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Manipulation (Ministry of Education), College of Engineering and Applied Sciences and School of Physics, Nanjing University, Nanjing 210093, China.

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This study introduces a self-characterization method for quantum measurements, reconstructing the response range to avoid reliance on known states. This novel approach achieves high fidelities, advancing quantum technology characterization.

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Area of Science:

  • Quantum Information Science
  • Quantum Metrology
  • Quantum Computing

Background:

  • Accurate description of measurement devices is crucial for quantum technologies and observing nonclassical behaviors.
  • Quantum tomography is the standard method for characterizing quantum detectors but relies on pre-characterized probe states, creating a circular dependency.
  • This reliance on known states limits the reliability of current quantum measurement characterization techniques.

Purpose of the Study:

  • To develop a self-characterization method for quantum measurements that eliminates the need for known probe states.
  • To establish a reliable technique for characterizing quantum detectors by reconstructing their response range.
  • To enable device-independent protocols in quantum information applications.

Main Methods:

  • A novel self-characterization technique based on reconstructing the response range of quantum measurements.
  • The response range encompasses the entirety of attainable measurement outcomes.
  • Implementation and characterization of two representative quantum measurements using photonic setups.

Main Results:

  • The self-characterization method successfully determined the response range of quantum measurements.
  • Achieved fidelities exceeding 99.99% when compared to conventional tomographic reconstructions.
  • Demonstrated the effectiveness of range-based techniques for quantum system characterization.

Conclusions:

  • The developed method provides a reliable and self-contained approach to characterizing quantum measurements.
  • Range-based characterization eliminates the circularity inherent in state-dependent tomography.
  • This work paves the way for novel device-independent quantum information protocols and improved quantum technologies.