| The performance of single photon detector is vital for quantum information technology, but there are several drawbacks of existing detectors.It has been reported that nano-antenna can greatly enhance the performance of single-photon resources and detectors. In this paper we simulate (by comsol) a superconducting nano-wire single-photon detector with cavity and anti-reflect coating and specially designed nano-antenna which enhances the photon collection efficiency of the detector without damaging the detector’s speed, thus overcome the dilemma of speed and efficiency. We further study how the nano-antenna’s characteristics, such as the antenna’s position, affect the active area and give out the best result. The photon collection efficiency is increased by92,73and24times, respectively, compared with previous detectors. Furthermore, we study the cause of gain difference, and predict the subsequent works that will help to enhance the performance of single-photon detectors. |
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