Abstract
We describe the development of a Quantum Interactive Learning Tutorial (QuILT) on quantum key distribution, a context which involves a practical application of quantum mechanics. The QuILT helps upper-level undergraduate students learn quantum mechanics using a simple two state system and was developed based upon the findings of cognitive research and physics education research. One protocol used in the QuILT involves generating a random shared key over a public channel for encrypting and decrypting information using single photons with non-orthogonal polarization states, and another protocol makes use of two entangled spin-1/2 particles. The QuILT uses a guided approach and focuses on helping students build links between the formalism and conceptual aspects of quantum physics without compromising the technical content. We also discuss findings from a preliminary in-class evaluation.
Highlights
Quantum mechanics (QM) is a challenging subject for undergraduate students
When we found that the quantum key distribution (QKD) Quantum Interactive Learning Tutorial (QuILT) was working well in individual administration and the posttest performance was significantly improved compared to the pretest performance, the first part of the QuILT that uses the B92 protocol with non-orthogonal polarization states
Once we determined that the QuILT was effective in individual administration, it was administered in three upper-level QM courses
Summary
Quantum mechanics (QM) is a challenging subject for undergraduate students. The QuILT helps students learn that the ability to detect an eavesdropper in secure QKD protocols is due to the fact that physical observables are in general not well-defined in a given quantum state but measurement collapses the state and gives the observable a definite value.
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