Generic Emergence of Objectivity in Position Basis

This lecture by Dr. Rajendra Bhati from the Center for Theoretical Physics PAS explores the fundamental question of how objectivity emerges in the position basis within quantum mechanics. Delve into the quantum decoherence paradigm, examining how quantum Darwinism and spectrum broadcast structures explain the transition from quantum to classical reality. Learn why existing models that assume a preferred basis for interactions may be problematic, and discover a simple no-go result showing that interactions between internal degrees of freedom inevitably disturb spatial degrees of freedom. Understand how this unavoidable disturbance leads to the objective encoding of positional information, even in purely spin-spin interactions, ultimately reinforcing the privileged role of position in the emergence of classical objectivity. This 52-minute Warsaw colloquium for theoretical physics was presented at CTP PAS on September 4, 2025.