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 atoms realized on an atom chip. We believe that our QZ-based approach can open a new path towards novel quantum sensing devices.
Highlights
The protection of quantum coherence [1, 2], or, complementarily, the measurement of environmental effects on a quantum system [3] is of great importance for the development of quantum technologies
In the ideal quantum Zeno effect, repeated quantum projective measurements can freeze the coherent dynamics of a quantum system
We experimentally test the effectiveness of the proposed noise sensing method on a properly engineered Bose-Einstein condensate of 87Rb atoms realized on an atom chip
Summary
The protection of quantum coherence [1, 2], or, complementarily, the measurement of environmental effects on a quantum system [3] is of great importance for the development of quantum technologies. Dynamical decoupling methods have been introduced with the aim of protecting a quantum dynamical evolution from decoherence [10, 11, 12, 13] and to infer specific features of the noise spectrum originating from the environment [14, 15, 16, 17, 18, 19, 20, 21] In this regard, quantum-state protection has been achieved by applying a sequence of quantum projective measurements, often called Zeno measurements, whose action is to freeze the dynamical evolution of the system under observation [22, 23, 24, 25].
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