Year: 2023
Type: article
Abstract: Quantum entanglement of atoms enables precision measurement and frequency metrology beyond the standard quantum limit that is imposed by the quantum projection noise. Here we propose employing entangled atoms in the synchronous differential measurement to enhance the detection sensitivity of spatially dependent frequency shift. Two ways of engineering entangled atoms are studied. The synchronous comparison between two pixels within an entangled atomic cloud leads to a sensitivity enhancement factor of 1.4 over the standard quantum limit. The sensitivity enhancement becomes saturated for a large number of atoms. In contrast, the synchronous comparison between two independent pixels that are individually composed of entangled atoms allows for a strong sensitivity enhancement by a factor of, for example, about 10 with ${10}^{3}$ entangled atoms in each pixel, corresponding to a reduction of the averaging time by a factor of about ${10}^{2}$. A large atom number may further elevate the sensitivity. Our work paves the way towards the entanglement-enhanced detection of gravitational redshift by means of the in situ imaging spectroscopy.
Source: Physical Review A
Authors: Deshui Yu, Jingbiao Chen, Shougang Zhang
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
Award: G8493139327
OpenAlex ID: W4367322175