Practical fermionic shadows enabled by improved sample-complexity bounds

Abstract

Classical shadow tomography is widely touted as supplying a family of methods for extracting information from quantum systems with polynomially scaling sample-complexities. In the current era of quantum computers possessing on the order of hundreds of qubits, however, polynomial scaling can nonetheless be prohibitive. Thus, there is a strong practical need for obtaining sample-complexity bounds which are as tight as possible. Here we address this in the case of fermionic (matchgate) shadows. For an arbitrary observable $O$ of Majorana degree $2k$, we improve the previously known sample-complexity bound of $\mathcal{O}(n^{2k}\Vert O{\Vert }_{\infty }^2)$ to $\mathcal{O}(n^k\Vert O{\Vert }_{\infty }^2)$, which is asymptotically tight. For example, for the estimation of the energy per mode of an open fermionic 50-site Hubbard chain with hopping and on site strenghts respectively given by $t=1$, $V=4$, and for a target additive precision of 0.1, this reduces the number of required shots from $\sim 10^9$ to $\sim 10^5$. That is, the new bound reduces the required number of shots by approximately $99.98\%$.