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Positive operator-valued measure reconstruction of a beam-splitter tree-based photon-number-resolving detector
Optics Letters
|April 2, 2015
Summary
We reconstructed a photon-number-resolving detector using beam-splitters and avalanche detectors. This device accurately counts photons up to four, overcoming dead time limitations for better performance.
Area of Science:
- Quantum optics
- Photon detection
Background:
- Accurate photon number detection is crucial for quantum information processing.
- Existing detectors face challenges with high count rates due to dead time effects.
Purpose of the Study:
- To reconstruct a photon-number-resolving detector (PNRD).
- To implement a "smart counting" routine to compensate for dead time.
Main Methods:
- Utilized three 50:50 beam-splitters in a tree configuration.
- Employed four single-photon avalanche detectors.
- Developed an electronic board for processing detector outputs and implementing smart counting.
Main Results:
- Successfully reconstructed a PNRD capable of discriminating photon number states from 0 to 4.
- The "smart counting" routine effectively compensated for dead time issues.
- Achieved accurate photon number resolution even at high count rates.
Conclusions:
- The presented PNRD design offers a viable solution for high-fidelity photon number measurements.
- The "smart counting" technique enhances detector performance in demanding applications.
- This work contributes to advancements in quantum measurement technologies.
