Publications (117)
On the (im)possibility of extending the GRW model to relativistic particles
Caitlin Jones, Tommaso Guaita, Angelo Bassi
Spontaneous collapse models are proposed modifications to quantum mechanics which aim to solve the measurement problem. In this article we will consider models which attempt to ext…
A macrorealistic test in hybrid quantum optomechanics
Marta Maria Marchese, Hannah McAleese, Angelo Bassi +1
We discuss a scheme for macrorealistic theories of the Leggett-Garg form [A. J. Leggett and A. Garg, Phys. Rev. Lett. 54, 857 (1985)]. Our scheme is based on a hybrid optomechanica…
Collapse dynamics are diffusive
Sandro Donadi, Luca Ferialdi, Angelo Bassi
Non-interferometric experiments have been successfully employed to constrain models of spontaneous wave function collapse, which predict a violation of the quantum superposition pr…
Noise gates for decoherent quantum circuits
Angelo Bassi, D. -A. Deckert
A major problem in exploiting microscopic systems for developing a new technology based on the principles of Quantum Information is the influence of noise which tends to work again…
Cancellation effects as a fingerprint of quantum collapse models at atomic scale
Kristian Piscicchia, Sandro Donadi, Simone Manti +4
In this work the spontaneous electromagnetic radiation from atomic systems, induced by dynamical wave-function collapse, is investigated in the X-rays domain. Strong departures are…
On the Electromagnetic Properties of Matter in Collapse Models
Angelo Bassi, Detlef Duerr
We discuss the electromagnetic properties of both a charged free particle, and a charged particle bounded by an harmonic potential, within collapse models. By choosing a particular…
Gravitational Decoherence
Angelo Bassi, André GroÃardt, Hendrik Ulbricht
We discuss effects of loss of coherence in low energy quantum systems caused by or related to gravitation, referred to as gravitational decoherence. These effects, resulting from r…
Non-interferometric rotational test of the Continuous Spontaneous Localisation model: enhancement of the collapse noise through shape optimisation
Davide Giordano Ario Altamura, Matteo Carlesso, Sandro Donadi +1
The Continuous Spontaneous Localisation (CSL) model is the most studied among collapse models, which describes the breakdown of the superposition principle for macroscopic systems.…
Decoherence Effects on Superpositions of Chiral States in a Chiral Molecule
Mohammad Bahrami, Afshin Shafiee, Angelo Bassi
The superposition of chiral states of chiral molecules, as delocalized quantum states of a many-particle system, can be used for the experimental investigations of decoherence theo…
Adjoint master equation for Quantum Brownian Motion
Matteo Carlesso, Angelo Bassi
Quantum brownian motion is a fundamental model for a proper understanding of open quantum systems in different contexts such as chemistry, condensed matter physics, bio-physics and…
Motion of an electron through vacuum fluctuations
Anirudh Gundhi, Angelo Bassi
We study the effects of the electromagnetic vacuum on the motion of a nonrelativistic electron. First, we derive the equation of motion for the expectation value of the electron's…
Colored and Dissipative Continuous Spontaneous Localization model and Bounds from Matter-Wave Interferometry
Marko Toroš, Giulio Gasbarri, Angelo Bassi
Matter-wave interferometry is a direct test of the quantum superposition principle for massive systems, and of collapse models. Here we show that the bounds placed by matter-wave i…
Testing Continuous Spontaneous Localization with Fermi liquids
Stephen L. Adler, Angelo Bassi, Matteo Carlesso +1
Collapse models describe phenomenologically the quantum-to-classical transition by adding suitable nonlinear and stochastic terms to the Schroedinger equation, thus (slightly) modi…
Spontaneous photon-emission from a non-relativistic free charged particle in collapse models: A case-study
Angelo Bassi, Sandro Donadi
We study the photon emission rate of a non relativistic charged particle interacting with an external classical noise through its position. Both the particle and the electromagneti…
Information and the foundations of quantum theory
Angelo Bassi, Saikat Ghosh, Tejinder P. Singh
We believe that the hypothesis `it from bit' originates from the assumption that probabilities have a fundamental, irremovable status in quantum theory. We argue against this assum…
Testing the foundations of quantum physics in space Interferometric and non-interferometric tests with Large Particles
Giulio Gasbarri, Alessio Belenchia, Matteo Carlesso +5
Quantum technologies are opening novel avenues for applied and fundamental science at an impressive pace. In this perspective article, we focus on the promises coming from the comb…
Stochastic Schroedinger Equations with General Complex Gaussian Noises
Angelo Bassi
Within the framework of stochastic Schroedinger equations, we show that the correspondence between statevector equations and ensemble equations is infinitely many to one, and we di…
Macroscopic quantum resonators (MAQRO): 2015 Update
Rainer Kaltenbaek, Markus Arndt, Markus Aspelmeyer +49
Do the laws of quantum physics still hold for macroscopic objects - this is at the heart of Schrödinger's cat paradox - or do gravitation or yet unknown effects set a limit for ma…
Collapse Models: a theoretical, experimental and philosophical review
Angelo Bassi, Mauro Dorato, Hendrik Ulbricht
n this paper, we review and connect the three essential conditions needed by the collapse model to achieve a complete and exact formulation, namely the theoretical, the experimenta…
Testing the quantum superposition principle in the frequency domain
Mohammad Bahrami, Angelo Bassi, Hendrik Ulbricht
New technological developments allow to explore the quantum properties of very complex systems, bringing the question of whether also macroscopic systems share such features, withi…
Terrestrial Very-Long-Baseline Atom Interferometry: Workshop Summary
Sven Abend, Baptiste Allard, Iván Alonso +250
This document presents a summary of the 2023 Terrestrial Very-Long-Baseline Atom Interferometry Workshop hosted by CERN. The workshop brought together experts from around the world…
Gravity as a classical channel and its dissipative generalization
Giovanni Di Bartolomeo, Matteo Carlesso, Angelo Bassi
Recent models formulated by Kafri, Taylor, and Milburn and by Tilloy and Diosi describe the gravitational interaction through a continuous measurement and feedback protocol. In suc…
Collapse in ultracold Bose Josephson junctions
Marco Bilardello, Andrea Trombettoni, Angelo Bassi
We investigate how ultracold atoms in double well potentials can be used to study and put bounds on models describing wave function collapse. We refer in particular to the continuo…
Constraining CSL strength parameter from standard cosmology and spectral distortions of CMBR
Kinjalk Lochan, Suratna Das, Angelo Bassi
Models of spontaneous wave function collapse modify the linear Schrödinger equation of standard Quantum Mechanics by adding stochastic non-linear terms to it. The aim of such mode…
AEDGE: Atomic Experiment for Dark Matter and Gravity Exploration in Space
Yousef Abou El-Neaj, Cristiano Alpigiani, Sana Amairi-Pyka +129
We propose in this White Paper a concept for a space experiment using cold atoms to search for ultra-light dark matter, and to detect gravitational waves in the frequency range bet…
Optomechanical test of the Schrödinger-Newton equation
André GroÃardt, James Bateman, Hendrik Ulbricht +1
The Schrödinger-Newton equation has been proposed as an experimentally testable alternative to quantum gravity, accessible at low energies. It contains self-gravitational terms, w…
On the testability of the Károlyházy model
Laria Figurato, Angelo Bassi, Sandro Donadi
Károlyházy's original proposal, suggesting that space-time fluctuations could be a source of decoherence in space, faced a significant challenge due to an unexpectedly high emiss…
Exact solution for a non-Markovian dissipative quantum dynamics
Luca Ferialdi, Angelo Bassi
We provide the exact analytic solution of the stochastic Schrödinger equation describing an harmonic oscillator interacting with a non-Markovian and dissipative environment. This…
Effects of Newtonian gravitational self-interaction in harmonically trapped quantum systems
André GroÃardt, James Bateman, Hendrik Ulbricht +1
The Schrödinger-Newton equation has gained attention in the recent past as a nonlinear modification of the Schrödinger equation due to a gravitational self-interaction. Such a mo…
Enhancement of the effects due to the Schrödinger-Newton equation
Davide Giordano Ario Altamura, José Luis Gaona-Reyes, Elliot Simcox +2
The Schrödinger-Newton (SN) equation introduces a nonlinear self-gravitational term to the standard Schrödinger equation, offering a paradigmatic model for semiclassical gravity.…
Efficient quantum algorithm to simulate open systems through a single environmental qubit
Giovanni Di Bartolomeo, Michele Vischi, Tommaso Feri +2
We present an efficient algorithm for simulating open quantum systems dynamics described by the Lindblad master equation on quantum computers, addressing key challenges in the fiel…
From equivalent Lagrangians to inequivalent open quantum system dynamics
Anirudh Gundhi, Oliviero Angeli, Angelo Bassi
Lagrangians can differ by a total derivative without altering the equations of motion, thus encoding the same physics. This is true both classically and quantum mechanically. We sh…
On the Tunneling Properties of non-Planar Molecules in a Gas Medium
Mohammad Bahrami, Angelo Bassi
We propose a simple, general, and accurate formula for analyzing the tunneling between classical configurations of a non-planar molecule in a gas medium, as a function of the therm…
Dissipative collapse models with non-white noises
Luca Ferialdi, Angelo Bassi
We study the generalization of the QMUPL model which accounts both for memory and dissipative effects. This is the first model where both features are combined. After having derive…
Seven non-standard models coupling quantum matter and gravity
Sandro Donadi, Angelo Bassi
We review seven models, which consistently couple quantum matter and (Newtonian) gravity in a non standard way. For each of them we present the underlying motivations, the main equ…
Can classical theories of gravity produce entanglement?
Anirudh Gundhi, Giorgia Infantino, Angelo Bassi
A recent paper published on Nature [Nature,646,813(2025)] by Aziz and Howl, claims that quantum particles become entangled when they interact gravitationally, even if the gravitati…
CSL reduction rate for rigid bodies
Luca Ferialdi, Angelo Bassi
In the context of spontaneous wave function collapse models, we investigate the properties of the Continuous Spontaneous Localization (CSL) collapse rate for rigid bodies. By explo…
Dynamical Reduction Models with General Gaussian Noises
Angelo Bassi, GianCarlo Ghirardi
We consider the effect of replacing in stochastic differential equations leading to the dynamical collapse of the statevector, white noise stochastic processes with non white ones.…
Minimum measurement time: lower bound on the frequency cutoff for collapse models
Stephen L. Adler, Angelo Bassi, Luca Ferialdi
The CSL model predicts a progressive breakdown of the quantum superposition principle, with a noise randomly driving the state of the system towards a localized one, thus accountin…
Bounds on Spontaneous Collapse model of Quantum Mechanics from formation of CMBR and Standard Cosmology
Suratna Das, Kinjalk Lochan, Angelo Bassi
Continuous Spontaneous Localization (CSL) model of Quantum Mechanics modifies Schrödinger equation by adding non-linear stochastic terms due to which the total energy of a system…
Non-Markovian quantum trajectories: an exact result
Angelo Bassi, Luca Ferialdi
We analyze the non-Markovian stochastic Schroedinger equation describing a particle subject to spontaneous collapses in space (in the language of collapse models), or subject to a…
Do dynamical reduction models imply that arithmetic does not apply to ordinary macroscopic objects?
GianCarlo Ghirardi, Angelo Bassi
We analyze a recent paper in which an alleged devastating criticism to the so called GRW proposal to account for the objectification of the properties of macroscopic systems has be…
Current tests of collapse models: How far can we push the limits of quantum mechanics?
Matteo Carlesso, Angelo Bassi
Collapse models implement a progressive loss of quantum coherence when the mass and the complexity of quantum systems increase. We will review such models and the current attempts…
Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map
Ivan Alonso, Cristiano Alpigiani, Brett Altschul +246
We summarize the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportu…
On spontaneous photon emission in collapse models
Stephen L. Adler, Angelo Bassi, Sandro Donadi
We reanalyze the problem of spontaneous photon emission in collapse models. We show that the extra term found by Bassi and Duerr is present for non-white (colored) noise, but its c…
Decoherence due to gravitational time dilation: analysis of competing decoherence effects
Matteo Carlesso, Angelo Bassi
Recently, a static gravitational field, such as that of the Earth, was proposed as a new source of decoherence [1]. We study the conditions under which it becomes the dominant deco…
On the effectiveness of the collapse in the Diósi-Penrose model
Laria Figurato, Marco Dirindin, José Luis Gaona-Reyes +3
The possibility that gravity plays a role in the collapse of the quantum wave function has been considered in the literature, and it is of relevance not only because it would provi…
Is quantum linear superposition an exact principle of nature?
Angelo Bassi, Tejinder P. Singh, Hendrik Ulbricht
The principle of linear superposition is a hallmark of quantum theory. It has been confirmed experimentally for photons, electrons, neutrons, atoms, for molecules having masses up…
Hybrid Classical-Quantum Newtonian Gravity with stable vacuum
Nicolò Piccione, Angelo Bassi
We investigate the Gravitational Poissonian Spontaneous Localization (GPSL) model, a hybrid classical-quantum model in which classical Newtonian gravity emerges from stochastic col…
Exploring the Effects of Mass Dependence in Spontaneous Collapse Models
Nicolò Piccione, Angelo Bassi
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.…
Room temperature test of the Continuous Spontaneous Localization model using a levitated micro-oscillator
Di Zheng, Yingchun Leng, Xi Kong +9
The Continuous Spontaneous Localization (CSL) model predicts a tiny break of energy conservation via a weak stochastic force acting on physical systems, which triggers the collapse…
Bohmian Mechanics, Collapse Models and the emergence of Classicality
Marko Toroš, Sandro Donadi, Angelo Bassi
We discuss the emergence of classical trajectories in Bohmian Mechanics (BM), when a macroscopic object interacts with an external environment. We show that in such a case the cond…
Stochastic unraveling of positive quantum dynamics
Matteo Caiaffa, Andrea Smirne, Angelo Bassi
Stochastic unravelings represent a useful tool to describe the dynamics of open quantum systems and standard methods, such as quantum state diffusion (QSD), call for the complete p…
Gravitational interaction through a feedback mechanism
José Luis Gaona-Reyes, Matteo Carlesso, Angelo Bassi
We study the models of Kafri, Taylor and Milburn (KTM) and Tilloy and Diósi (TD), both of which implement gravity between quantum systems through a continuous measurement and feed…
MAQRO -- BPS 2023 Research Campaign Whitepaper
Rainer Kaltenbaek, Markus Arndt, Markus Aspelmeyer +43
The objective of the proposed MAQRO mission is to harness space for achieving long free-fall times, extreme vacuum, nano-gravity, and cryogenic temperatures to test the foundations…
Unitary time-evolution in stochastic time-dependent Hilbert spaces
Luca Curcuraci, Stefano Bacchi, Angelo Bassi
In this work we study the unitary time-evolutions of quantum systems defined on infinite-dimensional separable time-dependent Hilbert spaces. Two possible cases are considered: a q…
Testing the gravitational field generated by a quantum superposition
Matteo Carlesso, Angelo Bassi, Mauro Paternostro +1
What gravitational field is generated by a massive quantum system in a spatial superposition? Despite decades of intensive theoretical and experimental research, we still do not kn…
Probing the Quantum Nature of Gravity through Classical Diffusion
Oliviero Angeli, Sandro Donadi, Giovanni Di Bartolomeo +3
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 abil…
No-faster-than-light-signaling implies linear evolutions. A re-derivation
Angelo Bassi, Kasra Hejazi
There is a growing interest, both from the theoretical as well as experimental side, to test the validity of the quantum superposition principle, and of theories which explicitly v…
More about Dynamical Reduction and the Enumeration Principle
Angelo Bassi, GianCarlo Ghirardi
In view of the arguments put forward by Clifton and Monton [1999] in a recent preprint, we reconsider the alleged conflict of dynamical reduction models with the enumeration princi…
When Cavendish meets Feynman: A quantum torsion balance for testing the quantumness of gravity
Matteo Carlesso, Mauro Paternostro, Hendrik Ulbricht +1
We propose a thought experiment, based on a mechanism that is reminiscent of Cavendish's torsion balance, to investigate the possible quantum nature of the gravitational field gene…
STE-QUEST -- Space Time Explorer and QUantum Equivalence principle Space Test: The 2022 medium-class mission concept
Naceur Gaaloul, Holger Ahlers, Leonardo Badurina +45
Space-borne quantum technologies, particularly those based on atom interferometry, are heralding a new era of strategic and robust space exploration. The unique conditions of space…
The Schrödinger-Newton equation and its foundations
Mohammad Bahrami, André GroÃardt, Sandro Donadi +1
The necessity of quantising the gravitational field is still subject to an open debate. In this paper we compare the approach of quantum gravity, with that of a fundamentally semi-…
Stochastic Methods and Dynamical Wave-function Collapse
Angelo Bassi, Kinjalk Lochan, Seema Satin +2
This brief article reviews stochastic processes as relevant to dynamical models of wave-function collapse, and is supplemental material for the review article arXiv:1204.4325
Decoherent Histories and Realism
Angelo Bassi, GianCarlo Ghirardi
We reconsider the Decoherent Histories approach to Quantum Mechanics and we analyze some problems related to its interpretation which, according to us, have not been adequately cla…
A Quantum Spectrometer for Arbitrary Noise
Daniel Goldwater, Peter Barker, Angelo Bassi +1
We present a technique for recovering the spectrum of a non-Markovian bosonic bath and/or non-Markovian noises coupled to an harmonic oscillator. The treatment is valid under the c…
Quantum foundations for quantum technologies in the International Year of Quantum (2025)
Angelo Bassi
From the very beginning, Quantum Mechanics has been accompanied by crucial foundational questions: the possibility of visualizing physical processes, the limits of measurement epit…
Collapse models with non-white noises
Stephen L. Adler, Angelo Bassi
We set up a general formalism for models of spontaneous wave function collapse with dynamics represented by a stochastic differential equation driven by general Gaussian noises, no…
Terrestrial Very-Long-Baseline Atom Interferometry: Summary of the Second Workshop
Adam Abdalla, Mahiro Abe, Sven Abend +307
This summary of the second Terrestrial Very-Long-Baseline Atom Interferometry (TVLBAI) Workshop provides a comprehensive overview of our meeting held in London in April 2024, build…
Hierarchical Generation and Design of Tree-Codes for Resource-Efficient Loss-Tolerant Quantum Communications
Francesco Cesa, Tommaso Feri, Angelo Bassi
We develop protocols for generating loss-tolerant quantum tree-codes; these are designed to safeguard information against qubit losses, with wide applications in quantum communicat…
A perturbative algorithm for rotational decoherence
Matteo Carlesso, Hamid Reza Naeij, Angelo Bassi
Recent advances in levitated optomechanics provide new perspectives for the use of rotational degrees of freedom for the development of quantum technologies as well as for testing…
On the decoherence effect of a stochastic gravitational perturbation on scalar matter and the possibility of its interferometric detection
Lorenzo Asprea, Angelo Bassi, Hendrik Ulbricht +1
We present a general master equation for the quantum dynamics of a scalar bosonic particle interacting with an external weak and stochastic gravitational field. The dynamics predic…
Models of Wave-function Collapse, Underlying Theories, and Experimental Tests
Angelo Bassi, Kinjalk Lochan, Seema Satin +2
Quantum mechanics is an extremely successful theory that agrees with every experiment. However, the principle of linear superposition, a central tenet of the theory, apparently con…
The Continuous Spontaneous Localization Layering Effect from a Lattice Perspective
Stephen L. Adler, Angelo Bassi, Matteo Carlesso
For a solid lattice, we rederive the Continuous Spontaneous Localization (CSL) noise total energy gain of a test mass starting from a Lindblad formulation, and from a similar start…
General Galilei Covariant Gaussian Maps
Giulio Gasbarri, Marko Toroš, Angelo Bassi
We characterize general non-Markovian Gaussian maps which are covariant under Galilean transformations. In particular, we characterize translational and Galilean covariant maps and…
Functional Lagrange formalism for time-non-local Lagrangians
Luca Ferialdi, Angelo Bassi
We develop a time-non-local (TNL) formalism based on variational calculus, which allows for the analysis of TNL Lagrangians. We derive the generalized Euler-Lagrange equations star…
Dynamical Reduction Models
Angelo Bassi, GianCarlo Ghirardi
The report presents an exhaustive review of the recent attempt to overcome the difficulties that standard quantum mechanics meets in accounting for the measurement (or macro-object…
A General Argument Against the Universal Validity of the Superposition Principle
Angelo Bassi, GianCarlo Ghirardi
We reconsider a well known problem of quantum theory, i.e. the so called measurement (or macro-objectification) problem, and we rederive the fact that it gives rise to serious prob…
Dissipative Continuous Spontaneous Localization (CSL) model
Andrea Smirne, Angelo Bassi
Collapse models explain the absence of quantum superpositions at the macroscopic scale, while giving practically the same predictions as quantum mechanics for microscopic systems.…
Quantum mechanics for non-inertial observers
Marko ToroÅ¡, André GroÃardt, Angelo Bassi
A recent analysis by Pikovski et al. [Nat. Phys. 11, 668 (2015)] has triggered interest in the question of how to include relativistic corrections in the quantum dynamics governing…
Dissipative extension of the Ghirardi-Rimini-Weber model
Andrea Smirne, Bassano Vacchini, Angelo Bassi
In this paper we present an extension of the Ghirardi-Rimini-Weber model for the spontaneous collapse of the wavefunction. Through the inclusion of dissipation, we avoid the diverg…
Practical quantum secure direct communication with squeezed states
Iris Paparelle, Faezeh Mousavi, Francesco Scazza +3
Quantum secure direct communication (QSDC) is a rapidly developing quantum communication approach, where secure information is directly transmitted, providing an alternative to key…
Present status and future challenges of non-interferometric tests of collapse models
Matteo Carlesso, Sandro Donadi, Luca Ferialdi +3
The superposition principle is the cornerstone of quantum mechanics, leading to a variety of genuinely quantum effects. Whether the principle applies also to macroscopic systems or…
Simulating photonic devices with noisy optical elements
Michele Vischi, Giovanni Di Bartolomeo, Massimiliano Proietti +4
Quantum computers are inherently affected by noise. While in the long-term error correction codes will account for noise at the cost of increasing physical qubits, in the near-term…
Bounds on Collapse Models from Matter-Wave Interferometry: Calculational details
Marko Toroš, Angelo Bassi
We present a simple derivation of the interference pattern in matter-wave interferometry as predicted by a class of master equations, by using the density matrix formalism. We appl…
Non-Markovian dynamics for a free quantum particle subject to spontaneous collapse in space: general solution and main properties
Angelo Bassi, Luca Ferialdi
We analyze the non-Markovian dynamics of a quantum system subject to spontaneous collapse in space. After having proved, under suitable conditions, the separation of the center-of-…
About the Notion of Truth in the Decoherent Histories Approach: a reply to Griffiths
Angelo Bassi, GianCarlo Ghirardi
Griffiths claims that the ``single family rule'', a basic postulate of the decoherent histories approach, rules out our requirement that any decoherent history has a unique truth v…
Quantum Technologies in Space
Rainer Kaltenbaek, Antonio Acin, Laszlo Bacsardi +17
Recently, the European Commission supported by many European countries has announced large investments towards the commercialization of quantum technology (QT) to address and mitig…
Reply to Comment on "Quantum mechanics for non-inertial observers"
Marko ToroÅ¡, André GroÃardt, Angelo Bassi
Our recent paper (arXiv:1701.04298 [quant-ph]) discussed the occurrence of a coupling of centre of mass and internal degrees of freedom for complex quantum systems in non-inertial…
Bounds on collapse models from cold-atom experiments
Marco Bilardello, Sandro Donadi, Andrea Vinante +1
The spontaneous localization mechanism of collapse models induces a Brownian motion in all physical systems. This effect is very weak, but experimental progress in creating ultraco…
Mitigating Coherent Errors through a Decoherence-Resistant Variational Framework employing Stabilizer State
Giovanni Di Bartolomeo, Giulio Crognaletti, Angelo Bassi +1
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…
Decoherence effects in non-classicality tests of gravity
Simone Rijavec, Matteo Carlesso, Angelo Bassi +2
The experimental observation of a clear quantum signature of gravity is believed to be out of the grasp of current technology. However, several recent promising proposals to test t…
Multilayer test masses to enhance the collapse noise
Matteo Carlesso, Andrea Vinante, Angelo Bassi
Recently, a non-thermal excess noise, compatible with the theoretical prediction provided by collapse models, was measured in a millikelvin nanomechanical cantilever experiment [Vi…
Novel CSL bounds from the noise-induced radiation emission from atoms
Sandro Donadi, Kristian Piscicchia, Raffaele Del Grande +3
We study spontaneous radiation emission from matter, as predicted by the Continuous Spontaneous Localization (CSL) collapse model. We show that, in an appropriate range of energies…
A general scheme for ensemble purification
Angelo Bassi, GianCarlo Ghirardi
We exhibit a general procedure to purify any given ensemble by identifying an appropriate interaction between the physical system S of the ensemble and the reference system K. We s…
On the Energy Increase in Space-Collapse Models
Angelo Bassi, Emiliano Ippoliti, Bassano Vacchini
A typical feature of spontaneous collapse models which aim at localizing wavefunctions in space is the violation of the principle of energy conservation. In the models proposed in…
Quantum-limited estimation of continuous spontaneous localization
Sam McMillen, Matteo Brunelli, Matteo Carlesso +4
We apply the formalism of quantum estimation theory to extract information about potential collapse mechanisms of the continuous spontaneous localisation (CSL) form. In order to es…
Quantum Physics in Space
Alessio Belenchia, Matteo Carlesso, Ãmer Bayraktar +17
Advances in quantum technologies are giving rise to a revolution in the way fundamental physics questions are explored at the empirical level. At the same time, they are the seeds…
Non-interferometric test of the Continuous Spontaneous Localization model based on rotational optomechanics
Matteo Carlesso, Mauro Paternostro, Hendrik Ulbricht +2
The Continuous Spontaneous Localization (CSL) model is the best known and studied among collapse models, which modify quantum mechanics and identify the fundamental reasons behind…
Quantum Theory: Exact or Approximate?
Stephen L. Adler, Angelo Bassi
Quantum mechanics has enjoyed a multitude of successes since its formulation in the early twentieth century. At the same time, it has generated puzzles that persist to this day. Th…