2025/09/19 by Saurav Thakur
#Albert Einstein #B.-G. Englert #D²+V²≤1 (Englert bound) #Englert inequality #Erwin Schrödinger (wave mechanics linkage to de Broglie) #FOS: Physical sciences #John A. Wheeler #Leonard Mandel #Lev Vaidman #Louis de Broglie #Marlan O. Scully #Niels Bohr #Optics #Paul Kwiat #Physical Sciences and Mathematics #Physics #Quantum Physics #Richard Feynman #Werner Heisenberg #Yakir Aharonov #absorptive interferometry #complementarity #complementarity bound D²+V²≤1 #decoherence #delayed emission #distinguishability #double‑slit #double‑slit interference #duality–entanglement relation #energy‑entangled photons #entanglement #entanglement‑assisted measurement #fringe visibility V #gravitational effects in interferometers #interference #interferometry #metasurface quantum photonics #non‑demolition/weak measurements #nterferometric sensitivity #optomechanical sensors #optomechanics #path distinguishability D #path information / which‑path #photovoltaic detection #photovoltaic detection decoherence and coherence control #quantum Fisher information (QFI) #quantum dots #quantum eraser #quantum eraser experiments #quantum interferometry #quantum mechanics #quantum optics #semiconductor detectors
paper · doi:10.17605/osf.io/6zs8k
We present a theoretical and experimental framework for the simultaneous observation of wave-like and particle-like signatures of quantum entities in variants of the canonical double-slit experiment. Standard interpretations of Bohr's complementarity principle assert that these two manifestations are mutually exclusive within a single experimental setup. Our approach circumvents this limitation by employing non-demolition or weak-measurement techniques, exploiting entangled auxiliary degrees of freedom, and designing detectors that measure both coherent interference patterns and discrete absorption or momentum-transfer events. We discuss four distinct experimental realizations: a photovoltaic detection screen, a photovoltaic slit apparatus, an optomechanical mirror detector, and a delayed thermal-emission configuration. Each scheme offers a pathway to empirically demonstrate a regime where fringe visibility V and path distinguishability D are simultaneously non-zero while respecting the duality relation D²+V² ≤ 1. This coexistence motivates what we term the duality illusion : the apparent exclusivity of wave and particle features arises not from their destruction, but from detector coupling and coherence suppression that determine which aspect becomes operationally manifest. Our findings thus suggest a reframing of complementarity as a statement about measurement resolution and detector design rather than a strict, absolute prohibition. Keywords: Wave-particle duality, Complementarity, Duality illusion, Quantum measurement, Weak measurement, Quantum optics, Optomechanics, Photovoltaic detection