[12p-N103-1~16] 3.10 Optical quantum physics and technologies

△ [12p-N103-3] Estimation of Gaussian random displacement using non-Gaussian states

〇(M2)Fumiya Hanamura¹, Warit Asavanant¹, Kosuke Fukui¹, Shunya Konno¹, Akira Furusawa^1,2 (1.Univ. of Tokyo, 2.RIKEN RQC)

Keywords:quantum estimation, quantum error correction, non-Gaussian state

In this work, we consider the problem of estimating displacement operations that follow a Gaussian distribution as a simplified problem of quantum error correction against Gaussian noise, which is important in optical continuous variable quantum computation. We show that there is a limit to the estimation accuracy when only Gaussian states and operations are used, and that the limit can be broken by using experimentally feasible states such as single-photon states. In this talk, I will discuss in detail the derivation of the Gaussian limit and the estimation using non-Gaussian states.