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Q: Fachverband Quantenoptik und Photonik

Q 61: Quantum Optics with Photons II

Q 61.4: Vortrag

Freitag, 10. März 2023, 12:00–12:15, E001

Photon counting with click detection — •Fabian Schlue¹, Michael Stefszky¹, Vladyslav Dyachuk¹, Suchitra Krishnaswamy², Jan Sperling², Benjamin Brecht¹, and Christine Silberhorn¹ — ¹Institute for Photonic Quantum Systems (PhoQS), Integrated Quantum Optics (IQO), Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany — ²Theoretical Quantum Science, Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany

Gaining knowledge about the photon-number distribution (PND) of an arbitrary input state is important for improving quantum technologies like quantum simulation and quantum key distribution. However, current photon number resolved (PNR) detectors (e.g. transition edge sensors) have very low response time and operate at millikelvin, compared to click detectors (e.g. superconducting nanowire single photon detectors), which are cheaper, faster and can operate at several kelvin. However, pseudo PNR can be added in a resource-efficient way to click detectors by using time multiplexed detection (TMD).

Here we present a TMD device, based on cascaded beam splitters, that provides a variable amount of pseudo PNR by changing the number of multiplexed time bins. This can be easily done by adding or removing extension modules with fiber connections. Depending on the experimental needs a trade off between lower measurement time or higher PNR can be made. We implement several detectors tailored to different experimental boundary conditions and investigate methods to retrieve the PND from the measured click statistics. In particular, how different approximations impact the reconstruction.