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HL: Fachverband Halbleiterphysik

HL 11: Materials and Devices for Quantum Technology I (joint session HL/QI)

HL 11.3: Talk

Monday, March 18, 2024, 15:30–15:45, EW 203

Real-Time Processing of Quantum Measurements: Quantum Polyspectra Approach to the Weak, Strong, and Single Photon Regime — •Armin Ghorbanietemad, Markus Sifft, and Daniel Hägele — Ruhr University Bochum, Faculty of Physics and Astronomy, Experimental Physics VI, Germany

Quantum polyspectra have recently been successfully utilized in the evaluation of continuous quantum measurement records across weak, strong, and single photon regimes. This analysis is conducted by comparing experimental quantum polyspectra with their theoretical counterparts [1]. Our freely accessible Python library, SignalSnap [2], offers an efficient GPU-based method for calculating the polyspectra. Expanding on this groundwork, we introduce new software for the real-time evaluation of quantum measurement data with MHz bandwidth using polyspectra. This approach enables immediate processing and interpretation of quantum measurements. The goal is to achieve real-time characterization of quantum systems by estimating their Liouvillians. This capability is crucial for deepening our understanding of quantum dynamics. Real-time evaluation of measurements allows experimentalist to find interesting parameter settings already in the lab or to identify obvious errors in the experiment, like drift, missalignment, or unwanted external noise.

[1] Sifft et al., Phys. Rev. Research 3, 033123 (2021).

[2] https://github.com/MarkusSifft/SignalSnap

Keywords: Quantum measurements; Polyspectra; Signal analysis