High-performance reconfigurable coincidence counting unit based on a field programmable gate array.

Area of Science:

• Physics
• Quantum Optics
• Quantum Information Science

Background:

• Coincidence counting units (CCUs) are crucial for detecting correlated events in quantum experiments.
• Existing CCUs often lack flexibility or are prohibitively expensive.

Purpose of the Study:

• To design and implement a high-performance, reconfigurable CCU using a low-cost field-programmable gate array (FPGA).
• To demonstrate superior performance and flexibility compared to existing CCU architectures.

Main Methods:

• Utilized a low-end FPGA and peripheral circuits for CCU development.
• Implemented reconfigurable system parameters including input delays, coincidence configurations, and time windows via FPGA programming.
• Designed for 8 logic inputs and 4 coincidence outputs, capable of measuring up to eight-fold coincidences.

Main Results:

• Achieved a minimum coincidence time window of 0.47 ns.
• Supported a maximum input frequency of 163 MHz.
• Demonstrated superior performance in key aspects compared to previous CCU designs despite a low-cost implementation.

Conclusions:

• The proposed reconfigurable CCU offers a cost-effective and high-performance solution for coincidence counting.
• Its flexibility and advanced capabilities make it suitable for diverse experimental research, particularly in quantum optics and quantum information.