  We are developing a quantum interactive learning tutorial (QuILT) on a
quantum eraser for students in upperlevel quantum mechanics. The QuILT exposes
students to contemporary topics in quantum mechanics and uses a guided approach
to learning. It adapts existing visualization tools to help students build
physical intuition about quantum phenomena and strives to help them develop the
ability to apply quantum principles in physical situations. The quantum eraser
apparatus in the gedanken (thought) experiments and simulations that students
learn from in the QuILT uses a MachZehnder Interferometer with single photons.
We also discuss findings from a preliminary in-class evaluation.
