- By:
- Marino Valle, Alberto M; Dowran, Mohammadjavad; Win, Aye; Jain, Umang; Kumar, Ashok; Lawrie, Benjamin J; Pooser, Raphael
- Journal Name:
- ACS Photonics
- Page Number:
- 3037-3045
- Volume:
- 11
- Issue Number:
- 8
- Publication Date:
- August 28, 2024
- View DOI Listing:
- https://doi.org/10.1021/acsphotonics.4c00256
Abstract
Quantum metrology takes advantage of quantum correlations to enhance the sensitivity of sensors and measurement techniques beyond their fundamental classical limit, given by the shot-noise limit. The use of both temporal and spatial correlations present in quantum states of light can extend quantum-enhanced sensing to a parallel configuration that can simultaneously probe an array of sensors or independently measure multiple parameters. To this end, we use multispatial-mode bright twin beams of light, which are characterized by independent quantum-correlated spatial subregions in addition to quantum temporal correlations, to probe a four-sensor quadrant plasmonic array. We show that it is possible to independently and simultaneously measure local changes in refractive index for all four sensors with a quantum enhancement in sensitivity in the range of 22% to 24% over the corresponding classical configuration. These results provide a first step toward highly parallel spatially resolved quantum-enhanced sensing techniques and pave the way toward more complex quantum sensing and quantum imaging platforms.
