Quantum-Limit Spectroscopy

Z. Ficek, R. Tanaś

Morgan W. Mitchell, Vito Giovanni Lucivero, Aleksandra Dimić +2 more

Evangelia Bisketzi, Animesh Datta

Tuvia Gefen, Maxim Khodas, Liam Paul McGuinness +2 more

Quantum spectroscopy with single two-level systems has considerably improved our ability to detect weak signals. Recently it was realized that for classical signals, precision and resolution of quantum spectroscopy is limited mainly by coherence of the signal and the stability of the clock used to measure time. The coherence time of the quantum probe, which can be significantly shorter, is not a major limiting factor in resolution measurements. Here, we address a similar question for spectroscopy of quantum signals, for example, a quantum sensor is used to detect a single nuclear spin. We present and analyze a novel correlation spectroscopy technique with performance that is limited by the coherence time of the target spins and the stability of the clock.

Vladislav V. Yakovlev

Brillouin spectroscopy and microscopy is widely used for remote sensing and imaging; however, the sensitivity of detection is often limited due to the available laser power for such measurements. Quantum light offers an alternative solution to such spectroscopy and imaging by reducing the noise below the classical shot-noise limit. We demonstrate the first results of Brillouin spectroscopy and imaging using quantum-enhanced detection and outline potential applications and future strategies for improved detection sensitivity.

Daniel F. Walls, M. D. Reid, P. Zoller +1 more