Teleportation-based quantum state tomography

TL;DR

This paper demonstrates that quantum teleportation can be used as a method for quantum state tomography, enabling the reconstruction of multi-qubit density matrices with minimal quantum resources.

Contribution

It introduces a teleportation-based protocol for quantum state tomography applicable to arbitrary multi-qubit states, requiring only Bell measurements and simple state preparations.

Findings

Successfully reconstructs two- and three-qubit states

Extends method to n-qubit states

Requires only Bell measurements and basic state preparations

Abstract

We explicitly show that the quantum teleportation protocol can be employed to completely reconstruct arbitrary two- and three-qubit density matrices. We also extend the present analysis to n-qubit density matrices. The only quantum resources needed to implement the teleportation-based quantum state tomography protocol are the ability to make Bell measurements and the ability to prepare a few different single qubit states to be teleported from Alice to Bob.