Experimental proof of quantum Zeno-assisted noise sensing
Hoang-Van Do, Cosimo Lovecchio, Ivana Mastroserio, Nicole Fabbri, F. S. Cataliotti, Stefano Gherardini, Matthias M. Müller, Nicola Dalla Pozza, Filippo Caruso · New Journal of Physics · 2019
Abstract In the ideal quantum Zeno (QZ) effect, repeated quantum projective measurements can freeze the coherent dynamics of a quantum system. However, in the weak QZ regime, measurement back-actions can allow the sensing of semi-classical field fluctuations. In this regard, we theoretically show how to combine the controlled manipulation of a quantum two-level system, used as a probe, with a sequence of projective measurements to have direct access to the noise correlation function. We experimentally test the effectiveness of the proposed noise sensing method on a properly engineered Bose–Einstein condensate of 87 Rb atoms realized on an atom chip. We believe that our QZ-based approach can open a new path towards novel quantum sensing devices.