Heidelberg 2015 – scientific programme

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A: Fachverband Atomphysik

A 15: Ultra-cold atoms, ions and BEC II (with Q)

A 15.2: Talk

Tuesday, March 24, 2015, 14:45–15:00, C/HSW

Noise spectroscopy with quantum gases — •Peter Federsel, Carola Rogulj, Tobias Menold, Malte Reinschmidt, Andreas Günther, and József Fortágh — Physikalisches Institut, Universität Tübingen, Germany

Local measurements of electric and magnetic field noise are fundamentally important for understanding charge transport in nanoscaled systems. Using a quantum gas, classical and even quantum noise, might be locally detected via magnetic and electric dipole transitions. This way, a quantum galvanometer for measuring current and current noise comes into direct reach[1].

Here we present a state- and energy-selective single atom detection scheme, which can be used to sense magnetic field fluctuations at the atoms’ hyperfine and Zeeman transition frequencies. Therefore, atoms which have undergone a transition are ionized and individually detected on a channel electron multiplier. We characterize the bandwidth and sensitivity of this spectrometer by applying external magnetic field fluctuations and find good agreement with theoretical predictions. Using correlation analysis of the time-resolved ion signal, the resolution of the spectrometer can be further increased.

[1] Kalman et al., Nano Letters 12, 435-439 (2012)