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Physics Letters A

Can quantum entangled states collapse spontaneously?

Nicolas Gisin

Published May 1, 1991• 3 citations
Publisher
DOI
10.1016/0375-9601(91)90644-n

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We investigate the specific form that the collapsed quantum state of a signal photon can take when its entangled idler is measured in an entangled ghost imaging configuration using a type II collinear phase matched spontaneous parametric downconversion (SPDC) interaction. Calculations of the correlated counting rate distributions in the ghost image plane and diffraction plane show that agreement between collapse and non-collapse models is obtained if the signal is assumed to collapse into a specific mixed state. However, if the signal is assumed to collapse into a pure state, significant differences arise between the predictions of the two collapse models.
Quantum state collapse is a fundamental aspect of quantum mechanics, often described as a spontaneous transition from superposition to a definite state. This paper explores the potential of computational modeling as a framework to understand this phenomenon, suggesting that collapse is not merely a discrete event but a complex, iterative process driven by a "collapse operator." We propose a detailed model incorporating feedback loops and entanglement, aiming to simulate the probabilistic evolution of quantum states. This research seeks to provide a novel approach to investigating collapse, potentially offering insights into the emergence of quantum phenomena and offering a new perspective on the nature of reality.