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This work investigates a case study of using physical-based sonification ofQuadratic Unconstrained Binary Optimization (QUBO) problems, optimized by theVariational Quantum Eigensolver (VQE) algorithm. The VQE approximates thesolution of the problem by using an iterative loop between the quantum computerand a classical optimization routine. This work explores the intermediarystatevectors found in each VQE iteration as the means of sonifying theoptimization process itself. The implementation was realised in the form of amusical interface prototype named Variational Quantum Harmonizer (VQH),providing potential design strategies for musical applications, focusing onchords, chord progressions, and arpeggios. The VQH can be used both to enhancedata visualization or to create artistic pieces. The methodology is alsorelevant in terms of how an artist would gain intuition towards achieving adesired musical sound by carefully designing QUBO cost functions. Flexiblemapping strategies could supply a broad portfolio of sounds for QUBO andquantum-inspired musical compositions, as demonstrated in a case studycomposition, "Dependent Origination" by Peter Thomas and Paulo Itaborai.

Variational Quantum Harmonizer: Generating Chord Progressions and Other Sonification Methods with the VQE Algorithm