  We investigate direct observation of quantum nonlocality without reference to
theoretical models (including Bell theorem) except quantum mechanics, with a
bipartite polarization-entangled state in which one photon immediately reduces
into a circular-polarization (CP) state after its partner is detected in
another CP state. Of essence is the mechanical detection of the CP state of a
photon that carries angular momentum and exerts a torque on a half-wave plate
whose mechanical motion is then varied. If implemented, the model-independent
observation of quantum nonlocality violates Lorentz invariance in experiment
and may indicate new fundamental physics beyond the Standard Model.
