Multi-dimensional quantum sensing

Luca Maggio, Vincenzo Tamma

We present a quantum sensing protocol for three-dimensional estimation of the difference between the momenta of two photons based on spatially resolved interferometric sampling measurements. The protocol attains ultimate quantum precision in the simultaneous estimation of the components of the relative momentum for any values of the parameters already with $\sim 2000$ sampling measurements and a bias below $1\%$. These results identify 3D spatially resolved two-photon interference as an efficient tool for multi-parameter quantum sensing, with potential applications in high-precision 3D localization, refractometry, and near-field calibration in free-space quantum technologies.

J. Ye, Yintao Wang, Ming-Zhong Ai +4 more

We realized ultrafast three-dimensional tracking of multiple nanodiamond sen-sors using a digital micromirror device, and therefore achieved three-dimensional dynami-cal multi-point quantum sensing. This work enables a broad range of applications such as multi-point temperature monitoring in live cells.

Yuichiro Matsuzaki

Edoardo Charbon A

Shuhong Hao, Dong Wang, Xutao Mo +2 more

Distributed quantum sensing has important applications in quantum-enhanced estimation of global parameters, which is the weighted sum of each sensor. Towards applications, it is essential to estimate more global parameters simultaneously. Here, we propose an improved quantum-enhanced distributed multi-parameter sensing of more than two global parameters simultaneously via Gaussian multipartite entanglement. We show that two global parameters, containing the real and imaginary parts of the complex amplitudes of multiple radio-frequency fields, can be estimated based on an Einstein-Podolsky-Rosen entangled state. Compared to the distributed quantum sensing with squeezed light in the same sensing network, the sensors are extended from M to 2 M in the improved scheme with multipartite entanglement. This work provides a practical approach for advancing high-precision multi-parameter quantum sensing technologies.