Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 57: Quantum Sensing: Spectroscopy I

FM 57.2: Talk

Wednesday, September 25, 2019, 14:30–14:45, 2006

Quantum Sensing using the Stochastic Quantum Zeno Effect — •Matthias M. Müller — Institute of Quantum Control, Peter Grünberg Institut, Forschungszentrum Jülich

The dynamics of quantum systems are unavoidably influenced by their environment and in turn observing a quantum system (probe) can allow one to measure its environment: Dynamical decoupling sequences as an extension of the Ramsey interference measurement allow to spectrally resolve a noise field coupled to the probe [1]. Here, we report also on dissipative manipulations of the probe leading to so-called Stochastic Quantum Zeno (SQZ) phenomena that can be seen as an extension of the Rabi measurement. Recently, we could detect time correlations in the noise through an ergodicity breaking in SQZ dynamics [2], and the concept was experimentally demonstrated with a BEC on a chip [3]. We present a robust method to reconstruct an unkown spectrum from measurements of the survival probability of the SQZ dynamics.

[1] C. L. Degen, F. Reinhard, and P. Cappellaro, Rev. Mod. Phys. 89, 035002 (2017). [2] M.M. Müller, S. Gherardini, and F. Caruso, Sci. Rep. 6, 38650 (2016). [3] S. Gherardini, C. Lovecchio, M.M. Müller, P. Lombardi, F. Caruso, and F.S. Cataliotti, Quantum Science and Technology 2 (1), 015007 (2017). [4] M.M. Müller, S. Gherardini, A. Smerzi, and F. Caruso, Phys. Rev. A 94, 042322 (2016). [5] M.M. Müller, S. Gherardini, and F. Caruso, Scientific Reports 8, 14278 (2018).