Limited quantum advantage for stellar interferometry via CV teleportation
Zixin Huang, Ben Q. Baragiola, Nicolas C. Menicucci, Mark M. Wilde · Quantum 2.0 Conference and Exhibition · 2024
We consider stellar interferometry in the continuous-variable (CV) quantum information formalism and use the quantum Fisher information (QFI) to characterize the performance of three key strategies: direct interferometry, local heterodyne, and a CV teleportation-based strategy. In the high-transmission regime, the CV teleportation strategy is inferior to DI. Curiously, in the high-loss regime, a small region of loss exists where the CV teleportation strategy slightly outperforms both DI and local heterodyne. We describe this advantage as limited because it occurs for a small region of loss, and the magnitude of the advantage is also small. We argue that practical difficulties further impede achieving any quantum advantage, limiting the merits of a CV teleportation-based strategy for stellar interferometry.