  Quantum theory is often regarded as challenging to learn and teach, with
advanced mathematical prerequisites ranging from complex numbers and
probability theory to matrix multiplication, vector space algebra and symbolic
manipulation within the Hilbert space formalism. It is traditionally considered
an advanced undergraduate or graduate-level subject.
  In this work, we challenge the conventional view by proposing "Quantum
Picturalism" as a new approach to teaching the fundamental concepts of quantum
theory and computation. We establish the foundations and methodology for an
ongoing educational experiment to investigate the question "From what age can
students learn quantum theory if taught using a diagrammatic approach?". We
anticipate that the primary benefit of leveraging such a diagrammatic approach,
which is conceptually intuitive yet mathematically rigorous, will be
eliminating some of the most daunting barriers to teaching and learning this
subject while enabling young learners to reason proficiently about high-level
problems. We posit that transitioning from symbolic presentations to pictorial
ones will increase the appeal of STEM education, attracting more diverse
audience.
