As quantum computing matures, organizations must engage early with the technology and eventually adopt it in their business operations to achieve a competitive edge. At the same time, quantum computing experts (e.g., researchers and technology providers) expect extensive input and collaboration with potential adopters to explore new application areas. However, the inherently counter-intuitive and complex theoretical principles of quantum theory discourage non-expert adopters of the technology from engaging in research and development. As a result, an increasing knowledge gap emerges. This paper proposes the QuantumShare ontology to capture and share quantum computing knowledge to support the collaboration between quantum experts and non-expert adopters, thereby bridging the present knowledge gap. We used the NeOn methodology to create QuantumShare systematically. We evaluated QuantumShare by applying it to the usage scenarios extracted from the literature and end-users.