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Japanese Physicists Use Light to Break Newton's Third Law  —  A Leap Toward Non-Reciprocal Quantum Materials A Groundbreaking Twist  —  Light-Induced Violation of Newton's Third Law In a discovery that challenges one of physics' most established principles, researchers in Japan have demonstrated how light can induce non-reciprocal interactions in solids — effectively breaking Newton's third law within a controlled environment. By findings, published on 18 September 2025 in Nature Communications , mark a revolutionary step in non-equilibrium physics , opening pathways to light-driven quantum materials and energy-efficient spintronic technologies . Related reading: Light-Induced Magnetism  —  The Future of Quantum Devices From Action and Reaction to Chase and Run Under ordinary conditions, all physical systems obey the law of action and reaction, maintaining symmetry through the principle of free energy minimization. However, in non-equilibrium systems — s...