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arXiv:2412.19746

Pulsed Laser as a Continuous Particle Stream

Ciro Micheletti Diniz, Franciele Renata Henrique, Bruno Souza, L. Misoguti, Paulo Henrique Dias Ferreira, Celso J. Villas-Bôas

Published Dec 27, 2024• 0 citations
arXivHTMLPDF

Abstract

With the recently introduced particle interpretation of the double-slit experiment for light fields [Phys. Rev. Lett. 134, 13360 (2025)], all related interference phenomena can be reinterpreted in terms of light particle states that either couple (bright) or do not couple (dark) with detectors. Here, we apply this approach to multimode pulsed lasers, unifying the description of their generation inside optical cavities and propagation outside them, now relying solely on quantum mechanics, i.e., without invoking wave superposition to explain pulse shaping. Specifically, we demonstrate that multimode interference presents a dominance of particle dark states over the bright ones and mode-locked pulsed lasers consist of a continuous photon beam, with photons forming bright states during pulses and dark states in between. Additionally, we analyze mode-locked pulsed lasers, showing that the theoretical bright-to-dark state ratio matches the experimental pulse-to-interval duration ratio.

DOI
10.48550/arxiv.2412.19746

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With the recently introduced particle interpretation of the double-slit experiment for light fields [Phys. Rev. Lett. 134, 13360 (2025)], all related interference phenomena can be reinterpreted in terms of light particle states that either couple (bright) or do not couple (dark) with detectors. Here, we apply this approach to multimode pulsed lasers, unifying the description of their generation inside optical cavities and propagation outside them, now relying solely on quantum mechanics, i.e., without invoking wave superposition to explain pulse shaping. Specifically, we demonstrate that multimode interference presents a dominance of particle dark states over the bright ones and mode-locked pulsed lasers consist of a continuous photon beam, with photons forming bright states during pulses and dark states in between. Additionally, we analyze mode-locked pulsed lasers, showing that the theoretical bright-to-dark state ratio matches the experimental pulse-to-interval duration ratio.
Building upon the recently introduced particle interpretation of the double-slit experiment [Phys. Rev. Lett. 134, 133603 (2025)] which attributes interference phenomena to detector-coupled (bright) and detector-uncoupled (dark) states of light, we develop a continuous-mode extension of the bright- and dark-state framework. This extension addresses a conceptual distinction between interference and diffraction, that is, the transition from a finite set of discrete paths to a continuum of modes. Through the construction of a complete detector-oriented basis for single-slit diffraction, we demonstrate that the observed diffraction pattern arises from projection of the photon state onto a single bright mode by identifying the detectable and undetectable modes, with photons detected at intensity minima having zero probability, as they reside in modes spanning an infinite-dimensional dark subspace. Our approach thus provides a unified particle-based explanation of diffraction that connects quantum and classical wave optics, and reveals distinctive quantum signatures in higher-order correlations.
Classical theory asserts that several electromagnetic waves cannot interact with matter if they interfere destructively to zero, whereas quantum mechanics predicts a nontrivial light-matter dynamics even when the average electric field vanishes. Here, we show that in quantum optics, classical interference emerges from collective bright and dark states of light, i.e., particular cases of two-mode binomial states, which are entangled superpositions of multimode photon-number states. This makes it possible to explain wave interference using the particle description of light and the superposition principle for linear systems only. It also sheds new light on an old debate concerning the origin of complementarity.
Interference phenomena, such as those observed in Young’s double-slit experiment, are foundational to quantum mechanics, yet their interpretation continues to spark debate. Villas-Boas et al. [Phys. Rev. Lett. 134, 133603 (2025)] propose a quantum-optical framework attributing non-detection in regions of destructive interference to photons occupying ``perfectly dark'' states, which they claim do not interact with a two-level atom sensor due to vanishing coupling in the Jaynes-Cummings Hamiltonian. We argue that this interpretation is fundamentally flawed. Dark states, such as the out-of-phase coherent state ∣α,−α⟩ |\alpha, -\alpha\rangle ∣α,−α⟩, are readily detectable in alternative experimental setups, including dispersive coupling in cavity QED and photon-counting detectors like photomultiplier tubes or avalanche photodiodes, which are sensitive to the photon number operator. This detectability undermines the assertion that dark states are the intrinsic cause of non-detection in destructive interference regions. Instead, the quantum mechanical superposition principle, combined with the Born rule, fully accounts for interference patterns across all detection schemes, as evidenced by well-established experiments such as single-photon double-slit interference, Hong-Ou-Mandel two-photon interference, and cavity QED measurements. By overgeneralizing a detector-specific effect, the dark-state framework introduces an unnecessary and redundant construct, as the standard quantum mechanical formalism already provides a complete and experimentally validated explanation of interference phenomena.
Abstract: Because the experiments rely only on basic geometrical optics, they are accessible to readers with standard high-school physics training, enabling independent replication and critical evaluation without the need for specialized expertise or authoritative interpretation.The phenomenon of light interference, often regarded as a cornerstone of wave optics, is rarely observed in everyday life. This paper revisits the classic double-slit experiment and demonstrates that its results are not a true representation of wave interference, but rather a technological artifact designed to produce alternating light and dark fringes. Through a series of rigorous experiments, we show that the observed patterns in the double-slit setup lack scientific universality and cannot be generalized to real-world light behavior. A simple triangular phase formula is introduced to demonstrate that white light cannot sustain phase relationships, fundamentally challenging the traditional wave-based explanations. Instead, the experiments support the pulse particle theory of light, which posits that light behaves as discrete pulses rather than continuous waves. This new perspective on light has profound implications, particularly in the field of optical communication. By understanding light as pulses, we open up new avenues for advancements in technologies like laser communication, offering fresh approaches to addressing challenges in speed, efficiency, and signal transmission.An earlier version of this work was submitted to Optica Open Preprints (DOI: 10.1364/opticaopen.27255981). At the time of writing, the corresponding author is unable to access the preprint record or associated PDF due to a 403 (Forbidden) access restriction, including when logged in as the submitting author. A request for clarification has been sent to the platform. This OSF record is maintained to ensure continued accessibility and transparency of the scholarly record.
In this paper, we study the effect of a which-path memory ancilla on the three-slit interference pattern within the framework of the bright--dark state description [Phys. Rev. Lett. 134, 133603 (2025)]. Whereas two slits give one bright mode, a photonic mode that couples to the detector atoms, and one dark mode, which does not couple to the detector atoms, three slits lead to one detector-coupled bright mode and a two-dimensional dark-mode subspace in the three-dimensional path space. We first discuss the classical three-slit interference pattern in terms of probability leakage into the dark subspace. We then study the von Neumann entropy SDS_DSD​ of the dark subspace and the coherence measures of the reduced photonic state obtained by tracing out the memory: dark-sector coherence CDC_DCD​ and bright--dark coherence CBDC_{BD}CBD​. These quantities bring out the internal quantum structure of the two-dimensional dark subspace. We show that, whereas CDC_DCD​ is not by itself a basis-independent physical observable, CBDC_{BD}CBD​ is basis-invariant. We establish that, for two paths, CBDC_{BD}CBD​ is fixed entirely by the populations and the single pairwise coherence, whereas for multiple paths, M≥3M\geq 3M≥3, it acquires a genuinely multipath contribution generated by asymmetry among the pairwise which-path overlaps. Finally, we distinguish the part of the path-coherence loss that is recoverable through a suitable measurement of the memory from the irreducible coherence deficit imposed by an uncontrolled environment.
We review studies of the fluctuations of light made accessible by the invention of the laser and the strong interactions realized in cavity QED experiments. Photon antibunching advocating the discrete (particles), is contrasted with amplitude squeezing which speaks of the continuous (waves). The tension between particles and waves is demonstrated by a recent experiment which combines the measurement strategies used to observe these nonclassical behaviors of light [Phys. Rev. Lett. 85, 3149 (2000)].