Optimising detector readout settings for the detection of spatial correlations between SPDC photon-pairs

Area of Science:

• Quantum optics
• Photonics
• Quantum information science

Background:

• Spontaneous parametric down-conversion (SPDC) generates photon-pairs with inherent spatial correlations.
• These correlations are vital for advanced applications like quantum imaging and sensing.
• Detecting these correlations requires sensitive single-photon detector arrays, which present challenges due to noise.

Purpose of the Study:

• To investigate and compare various readout modes of an Electron-Multiplying Charge-Coupled Device (EMCCD) camera.
• To characterize the optimal EMCCD readout mode for detecting spatial correlations in SPDC photon-pairs.
• To inform the selection of detector arrays for quantum, low-light, and enhanced-resolution imaging systems.

Main Methods:

• Utilized an EMCCD camera to measure spatial correlations of SPDC photon-pairs.
• Systematically evaluated a wide range of EMCCD camera readout modes.
• Assessed detection performance against optical and electronic noise backgrounds.

Main Results:

• Demonstrated significant differences in the ability of various EMCCD readout modes to detect spatial correlations.
• Identified specific readout modes that offer superior performance for this task.
• Quantified the impact of noise on correlation measurements across different modes.

Conclusions:

• The choice of EMCCD readout mode critically impacts the measurement of quantum spatial correlations.
• Optimal mode selection enhances the fidelity of quantum correlation detection.
• This study provides essential guidance for utilizing detector arrays in quantum imaging and sensing.