Understanding quantum mechanics is inherently challenging due to its counterintuitive principles. Quantum Intuition XR is an interactive, extended reality (XR) experience designed to make quantum concepts tangible. Our system visualizes core principles of quantum computing, including qubits, superposition, entanglement, and measurement, through immersive interaction. Using a Mixed Reality headset, users engage with floating qubits, manipulate their states via controllers, and observe entanglement dynamics through real-time audiovisual feedback. A key feature of our implementation is the mathematically accurate and dynamic representation of qubits, both individually and while interacting with each other. The visualization of the qubit states evolve-rotate, shrink, grow, entangle-depending on their actual quantum states, which depend on variables such as proximity to other qubits and user interaction. Technical validation, along with preliminary demonstrations and feedback from quantum specialists, indicate that the system accurately represents quantum phenomena, suggesting strong potential to educate and enhance quantum intuition for non-expert audiences. A user study with non-experts further supports the system's accessibility and effectiveness in facilitating intuitive understanding of key quantum concepts. This approach bridges abstract quantum mechanics with embodied learning, offering an intuitive and accessible way for users to explore quantum phenomena. Future work will focus on expanding multi-user interactions and refining the fidelity of quantum state visualizations.

When several individuals collaborate on a shared task, their brain activities often synchronize. This phenomenon, known as Inter-brain Synchronization (IBS), is notable for inducing prosocial outcomes such as enhanced interpersonal feelings, including closeness, trust, empathy, and more. Further strengthening the IBS with the aid of external feedback would be beneficial for scenarios where those prosocial feelings play a vital role in interpersonal communication, such as rehabilitation between a therapist and a patient, motor skill learning between a teacher and a student, and group performance art. This paper investigates whether visual, auditory, and haptic feedback of the IBS level can further enhance its intensity, offering design recommendations for feedback systems in IBS. We report findings when three different types of feedback were provided: IBS level feedback by means of on-body projection mapping, sonification using chords, and vibration bands attached to the wrist.