Acquisition of an SNSPD system

The Niels Bohr Institute is part of the Faculty of SCIENCE at the University of Copenhagen. The Niels Bohr Institute has a 100 year long tradition of excellence within science, in particular within the area of quantum physics. The institute was inaugurated on March 3, 1921, by Professor Niels Bohr. We are approx. 430 researchers, 70 administrative and technical staff, 100 PhD students and 400 students. The European Physical Society has declared the Niels Bohr Institute a Historic Site of great international importance for the development of physics and research.

The SNSPD system will be part of an experimental setup intended to enable high-performance characterization of quantum photon emitters for the development of fault tolerant quantum computing hardware based on photons. This requires the capability to implement high-efficiency, fast, and low-noise detection of single photons emitted from quantum dots. We aim to achieve this by, amongst other things, acquiring a detector with ~10 ps time resolution. As different quantum dots materials with different transition frequencies will be examined, multiple different detectors are required.

Only Single Quantum can deliver an off-the-shelf SNSPD system with channels that simultaneously fulfill the following requirements:

940nm,>80% efficiency, <15ps time jitter

780nm,>85% efficiency, <15ps time jitter

1550nm broadband, >80% efficiency with expected efficiency >50% at 1310nm .

The simultaneous fulfilment of all the properties described above is required to achieve the highly demanding prerequisites of hardware for quantum computing. The particular targeted usecases/applications for which such requirements are key include:

- Direct characterisation of the optical coherence properties of quantum dots by resolving the lineshape of the emitted photons with fast detection.

- Error-mitigation techniques requiring fast detection (low jitter) to erase frequency mismatches between different emitted photons.

- High-rate operations, efficient characterization, and loss-correction techniques require high-efficiency detectors.

- Compatibility of the detection system with a broad range of wavelengths to investigate multiple types of quantum emitters to identify the explore multiple promising candidates for quantum photonic hardware development.