Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.36: Poster

Wednesday, March 22, 2017, 15:00–19:00, P1A

Sensing Weak Microwave Signals by Quantum Control — •Timo Joas, Andreas M. Waeber, Georg Braunbeck, and Friedemann Reinhard — Walter Schottky Institut and Physik-Department, Technische Universität München, Am Coulombwall 4, 85748 Garching

Solid state qubits, such as the Nitrogen-Vacancy (NV) center in diamond, are attractive sensors for nanoscale magnetic and electric fields, owing to their atomically small size [1]. A major key to their success have been dynamical decoupling protocols (DD), which enhance sensitivity to weak AC signals such as the field of nuclear spins from a single protein [2]. However, those methods are currently limited to signal frequencies up to several MHz.

Here, we present a novel DD protocol specifically designed to detect weak fields close to the NV’s transition frequency (≈ 2 GHz). Our scheme is a pulsed version of Autler-Townes spectroscopy [3] with improved spectral resolution. As a result, we demonstrate slow Rabi oscillations with a period up to Ω_Rabi⁻¹ ∼ T₂ driven by a weak signal field. The corresponding sensitivity could enable various applications. Specifically, we consider detectors for radio-astronomy and ultrasound, as well as fundamental research on spin-phonon coupling.

[1] Taylor et al., Nature Physics 4 (2008) [2] Lovchinsky et al., Science 351 (2016) [3] Gordon et al., Appl. Phys. Lett. 105 (2015)