Continuous-variable graph states for quantum metrology

Abstract

Graph states are a unique resource for quantum information processing, such as measurement-based quantum computation. Here, we theoretically investigate the use of continuous-variable graph states for single-parameter quantum metrology, including both phase and displacement sensing. We identified the optimal graph states for the two sensing modalities and showed that Heisenberg scaling of the accuracy for both phase and displacement sensing can be achieved with local homodyne measurements.