Advance Journal of Science Engineering and Technology
Research Article
• Open Access
Quantum Entanglement and the Possible Role of Backward-Propagating Pulses: A Time-Symmetric Perspective on Quantum Correlations
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Quantum entanglement remains one of the most intriguing and conceptually challenging phenomena in quantum mechanics. While the standard quantum formalism accurately predicts entanglement, the physical mechanism underlying the emergence of nonlocal quantum correlations remains the subject of ongoing debate. In this work, we propose a theoretical framework suggesting that backward-propagating solutions of the Schrödinger equation may provide an alternative interpretation of the origin of quantum entanglement. Building upon perturbative solutions previously introduced by Qian (2026), we examine the spatiotemporal influence regions of two complementary wave solutions and analyze their contributions to the density operator. We argue that when only forward-propagating solutions are considered, the complementary nature of the influence regions suppresses coherence between distinct states. By introducing a time-reversed propagation model, overlapping spacetime regions become possible, allowing the appearance of off-diagonal coherence terms in the density operator commonly associated with quantum entanglement. The proposed interpretation is discussed alongside existing time-symmetric approaches, including the Transactional Interpretation, the Two-State Vector Formalism, Klyshko's Advanced Wave Picture, and recent developments in quantum optics. Rather than replacing conventional quantum mechanics, this work offers a complementary theoretical perspective that may contribute to ongoing discussions concerning the foundations of quantum nonlocality, retrocausality, and time symmetry. Possible experimental approaches for evaluating the proposed framework are also outlined.
Keywords
quantum entanglement, backward pulses, time reversal, Schrödinger equation, density operator, retrocausality, advanced waves, nonlocality, quantum optics,References
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