Qubit Instrumentation of Entanglement

This chapter and the experiments described within explore how `human entanglement' might be represented and even emulated by physical entanglement. To achieve this, a notion of `tonal centrality' between two musicians is captured via MIDI and passed as a parameter into a quantum simulation taking place on an embedded device (a Raspberry Pi Pico). The results of these simulations are then coded back into MIDI and sent to the players' instruments. The closer the musicians' tonality is, the more their instruments will be entangled in a $|\Phi^+ \rangle$ state, and the further away they are the more their instruments will be entangled in a $|\Psi^+ \rangle$ state. The intention is to create random parameters that are correlative - \emph{i.e.} the same on both instruments - or anti-correlative - \emph{i.e.} the bit-wise opposite of each other, influenced by the tonal relationship from the players. These random parameters sharing these particular properties add a new dimension for quantum-musical expression. This concept was realised experimentally, and the full code and sample outputs are provided. This work aims to pave the way for musicians to explore and experience quantum emulations of their own musical experiences, adding a new nuance and possibilities for the future of \emph{entangled ensembles.}