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IEEE International Conference on Electronics, Computing and Communication Technologies (CONECCT)

Design and Development of Flexible and Low-Cost Coincidence Counting Unit

Alok Kumar Gupta, R. Sankara Prasad, L. Srivani, D. Thirugnana Murthy, B.K. Panigrahi, G. Raghavan

Published Mar 1, 2018• 1 citation
Publisher

Abstract

A flexible and low-cost Coincidence Counting Unit (CCU) with customizable features that are software selectable is designed and developed for the use in various experiments of quantum information and quantum metrology. A digital logic-based implementation approach using Field Programmable Gate Array is followed with specific emphasis on reducing the time for coincidence events of photons and making it easily scalable. In this paper, an 8-channel CCU with software configurable features such as coincidence window selection (in increment of 0.54 ns) and 8-fold coincidences (up to 4 sets) at a time has been implemented.

DOI
10.1109/conecct.2018.8482368

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A flexible and low-cost Coincidence Counting Unit (CCU) with customizable features that are software selectable is designed and developed for the use in various experiments of quantum information and quantum metrology. A digital logic-based implementation approach using Field Programmable Gate Array is followed with specific emphasis on reducing the time for coincidence events of photons and making it easily scalable. In this paper, an 8-channel CCU with software configurable features such as coincidence window selection (in increment of 0.54 ns) and 8-fold coincidences (up to 4 sets) at a time has been implemented.
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Coincidence counting is widely used in quantum optics.It could be used in measuring the pairs of polarization entangled photons and single photon interference.In quantum experiments,coincidence counting often needs more than 3 channels.In this case,it is necessary to use FPGA(Field-Programmable Gate Array) instead of discrete logic chips.FPGA also has the advantage of low cost and small size.Coincidence counter based on FPGA could support coincidence time window from 1 ns to several hundred ns.This helps to avoid noised caused by background light.This paper introduces the principle of multi-channel coincidence counter based on FPGA and gives its performance experimentally with two single photon counting modules.
Real-time analysis of single-photon coincidence is critical in photonic quantum computing. The large channel number and high counting rate foreseen in such experiments pose a big challenge for the conventional time tagged method and coincidence instruments. Here we propose a real-time time-tagged coincidence method and a data filtering solution, demonstrated by a 32-channel coincidence counting unit that has been implemented successfully on a field-programmable gate array system. The unit provides high counting rates, a tunable coincidence window, and a timing resolution of 390 ps. Beyond that, it is feasible to be scaled up to 104 channels and is thus ideally suited for channel consuming applications such as boson sampling. Based on the versatility and scalability the unit has shown, we believe that it is the turn-key solution for many single-photon coincidence counting applications in photonic quantum computing.