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Non-Markovian Poissonian Spontaneous Collapse Models
Nicolò Piccione
9 July 2026
Spontaneous collapse models provide a possible solution to the measurement problem by modifying standard quantum dynamics. The modification consists of adding non-linear and stochastic terms inducing wavefunction collapse in space. Non-Markovian versions of these models are…
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Gravitational Poissonian Spontaneous Localization Model of Hybrid Quantum-Classical Newtonian Gravity: Energy Increase and Experimental Bounds
Nicolò Piccione
22 February 2026
The Gravitational Poissonian Spontaneous Localization (GPSL) model is a hybrid classical-quantum framework in which Newtonian gravity emerges from stochastic collapses of a smeared mass-density operator. Consistency of the hybrid dynamics entails momentum diffusion and, hence,…
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Diffusion Minimization via Optimal Smearing in Collapse and Hybrid Classical-Quantum Gravitational Models
Nicolò Piccione
1 November 2025
Spontaneous diffusion (i.e., non-conservation of energy) is a prominent, testable prediction of collapse and hybrid classical-quantum gravitational models. Without smearing of the mass density operator, the associated heating (or energy increase) rate diverges, yet the smearing…
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Mitigating Coherent Errors through a Decoherence-Resistant Variational Framework employing Stabilizer State
Giovanni Di Bartolomeo, Giulio Crognaletti, Angelo Bassi, Michele Vischi
23 October 2025
Stabilizer states are a central resource in quantum information processing, underpinning a wide range of applications. While they can be efficiently generated via Clifford circuits, the presence of coherent errors, such as small-angle miscalibrations in native gate…
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Spontaneous Collapse Models
Matteo Carlesso, Sandro Donadi
26 August 2025
Collapse models are phenomenological models introduced to solve the measurement problem in quantum mechanics. They modify the Schr\"odinger equation by adding non-linear and stochastic terms, which induce the wavefunction collapse in space. The collapse effects are negligible…
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Towards relativistic generalization of collapse models
Anirudh Gundhi, Lajos Diósi, Matteo Carlesso
9 July 2025
Spontaneous collapse models provide a possible, testable solution to the quantum measurement problem. While experiments are providing increasingly stronger bounds on their parameters, a full-fledged relativistic extension is still missing. Previous attempts have encountered…
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Hybrid Classical-Quantum Newtonian Gravity with stable vacuum
Nicolò Piccione, Angelo Bassi
7 February 2025
We investigate the Gravitational Poissonian Spontaneous Localization (GPSL) model, a hybrid classical-quantum model in which classical Newtonian gravity emerges from stochastic collapses of the mass density operator, and consistently couples to quantum matter. Unlike models…
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Exploring the Effects of Mass Dependence in Spontaneous Collapse Models
Nicolò Piccione, Angelo Bassi
29 January 2025
Spontaneous collapse models aim to solve the long-standing measurement problem in quantum mechanics by modifying the theory's dynamics to include objective wave function collapses. These collapses occur randomly in space, bridging the gap between quantum and classical behavior.…
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Entanglement in Markovian hybrid classical-quantum theories of gravity
Oliviero Angeli, Matteo Carlesso
27 January 2025
Markovian master equations underlie many areas of modern physics and, despite their apparent simplicity, they encode a rich and complex dynamics which is still under active research. We identify a class of continuous variable Markovian master equations for which positivity and…
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Probing the Quantum Nature of Gravity through Classical Diffusion
Oliviero Angeli, Sandro Donadi, Giovanni Di Bartolomeo, José Luis Gaona-Reyes, Andrea Vinante, Angelo Bassi
22 January 2025
The question of whether gravity is fundamentally quantum remains one of the deepest open problems in modern physics. A recently explored approach consists of testing gravity's ability to entangle quantum systems, which requires preparing and controlling massive quantum states -…
