Welcome!

This website, maintained by Paul Kwiat's quantum information group , is intended to be useful to a variety of visitors. First and foremost, it is meant to provide a practical starting point for experimental groups setting up quantum tomgraphy systems. Secondly, we believe the information here can act as an introduction to quantum tomography for those just learning about the subject. Lastly, we think that even experienced researchers in the field may find some tips and tricks that we use helpful. No matter who you, are, we would like to welcome you to our website. The website will continue to grow as we learn new things and as we have time to flush out the material already here.

What is Tomography?

Quantum state tomography is the process by which a quantum state is reconstructed using measurements on an ensemble of identical quantum states. Because measurement of a quantum state (in general) changes the state being measured, getting a complete picture of that state requires measurements on many state copies.

Website Outline

This site is organized into two major sections. Tomography Theory contains the theoretical foundations necessary for tomography, information about the specific systems that we use, and the modifications, measurements, and data processing that are necessary to perform a real, experimental tomography. (Most of this information is contained in a large book chapter available for download.) Tomography Code contains all of the Matlab code that we use to analyze our data, with descriptions of some of the most important functions.
A Real-time tomography interface is also available, but we are still verifying its functionality.

About Us

This site and the code available for download were written by Joe Altepeter and Evan Jeffrey, in Paul Kwiat's lab, at the University of Illinois in Urbana-Champaign. For more information of us and the other work that goes on in our lab, please see our group website.