This paper presents a 20-channel coincidence counting unit (CCU) using a low-end fieldprogrammable gate array (FPGA). The architecture of the CCU can be configured arbitrarily to measure from twofold to twentyfold coincidence counts thanks to a multifold controllable architecture, which can be easily manipulated by a graphical user interface (GUI) program. In addition, it provides up to 20 of each input signal count simultaneously. The experimental results show twentyfold coincidence counts with the resolution occurring in a less than 0.5 ns coincidence window. This CCU has appropriate characteristics for various quantum optics experiments using multi-photon qubits.
Bibliographical noteFunding Information:
This research was funded by the Korea Institute of Science and Technology, grant number 2E30620; the National Research Foundation of Korea, grant numbers 2019M3E4A107866011, 2019M3E4A1079777, and 2019R1A2C2006381; and the Institute for Information and Communications Technology Promotion, grant numbers 2020-0-00947 and 2020-0-00972.
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
All Science Journal Classification (ASJC) codes
- Control and Systems Engineering
- Signal Processing
- Hardware and Architecture
- Computer Networks and Communications
- Electrical and Electronic Engineering