Pure state tomography with parallel unentangled measurements

TL;DR

This paper introduces efficient methods for pure quantum state tomography using parallel unentangled measurements, enabling easier implementation and improved estimation accuracy for pure states.

Contribution

It proposes two measurement schemes and algorithms tailored for pure state tomography with parallel unentangled measurements, enhancing practical feasibility and estimation precision.

Findings

Methods outperform traditional approaches in numerical tests

Measurement schemes are easy to implement in practice

Algorithms effectively recover pure states from measurement data

Abstract

Quantum state tomography (QST) aims at estimating a quantum state from averaged quantum measurements made on copies of the state. Most quantum algorithms rely on QST at some point and it is a well explored topic in the literature, mostly for mixed states. In this paper we focus on the QST of a pure quantum state using parallel unentangled measurements. Pure states are a small but useful subset of all quantum states, their tomography requires fewer measurements and is essentially a phase recovery problem. Parallel unentangled measurements are easy to implement in practice because they allow the user to measure each qubit individually. We propose two sets of quantum measurements that one can make on a pure state as well as the algorithms that use the measurements outcomes in order to identify the state. We also discuss how those estimates can be fined tuned by finding the state that maximizes the likelihood of the measurements with different variants of the likelihood. The performances of the proposed three types of QST methods are validated by means of detailed numerical tests.