Local mapping of detector response for reliable quantum state estimation.

Area of Science:

• Quantum physics
• Quantum optics
• Metrology

Background:

• Accurate calibration of quantum detectors is crucial for advancing quantum physics and technologies.
• Existing quantum detector tomography methods face challenges with increasing complexity and data demands.
• Many-outcome quantum detectors require versatile characterization techniques for reliable operation.

Purpose of the Study:

• To present an alternative, versatile characterization technique for many-outcome quantum detectors.
• To overcome the limitations of quantum detector tomography in complex systems.
• To enable accurate calibration without extensive numerical post-processing.

Main Methods:

• Experimental implementation of a novel detector characterization technique.
• Limiting the input calibration region to simplify the process.
• Avoiding numerical post-processing for faster analysis.

Main Results:

• Successfully calibrated a many-outcome quantum detector.
• Demonstrated the technique's applicability in a simplified experimental setup.
• The calibrated detector was used to estimate non-classical photon number states.

Conclusions:

• The developed technique offers a practical alternative for characterizing complex quantum detectors.
• This method facilitates advancements in quantum measurement and quantum-enhanced technologies.
• It paves the way for more robust quantum information processing and secure communication systems.