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Unitary Quantum Process Tomography with Unreliable Pure Input States by Verdeil, François; Deville, Yannick is a scholarly article available to read on EtoBox.

What is Unitary Quantum Process Tomography with Unreliable Pure Input States about?

Quantum process tomography (QPT) methods aim at identifying a given quantum process. The present paper focuses on the estimation of a unitary process. This class is of particular interest because quantum mechanics postulates that the evolution of any closed quantum system is described by a unitary transformation. The standard approach of QTP is to measure copies of a particular set of predetermined (generally pure) states after they have been modified by the process to be identified. The main problem with this setup is that preparing an input state and setting it precisely to a predetermined value is challenging and thus yields errors. These errors can be decomposed into a sum of centred errors (i.e. whose average on all the copies is zero) and systematic errors that are the same on all the copies, the latter is often the main source of error in QPT. The algorithm we introduce in the current paper works for any input states that make QPT theoretically possible. The fact that we do not require the input states to be precisely set to predetermined values means that we can use a trick to remove the issue of systematic errors by considering that some states are unknown but measured bef

Author

Verdeil, François; Deville, Yannick

Published

2023

Language

EN