We consider the possibility to measure the quantum decoherence using gravitational wave interferometers. Gravitational wave interferometers create the superposition state of photons and measure the interference of the photon state. If the decoherence occurs, the interference of the photon state vanishes and it can be measured by the interferometers. As examples of decoherence mechanisms, we consider 1) decoherence by spontaneous localization, 2) gravitational decoherence and 3) decoherence by extra-dimensional gravity.We consider the possibility to measure the quantum decoherence using gravitational wave interferometers. Gravitational wave interferometers create the superposition state of photons and measure the interference of the photon state. If the decoherence occurs, the interference of the photon state vanishes and it can be measured by the interferometers. As examples of decoherence mechanisms, we consider 1) decoherence by spontaneous localization, 2) gravitational decoherence and 3) decoherence by extra-dimensional gravity.

arXiv:0808.1999Aug 14, 20080 citations

Quantum Measurement, Gravitation, and Locality

D. V. Ahluwalia

This essay argues that when measurement processes involve energies of the order of the Planck scale, the fundamental assumption of locality may no longer be a good approximation. Idealized position measurements of two distinguishable spin- $0$ particles are considered. The measurements alter the space-time metric in a fundamental manner governed by the commutation relations $[x_i\\,\\,p_j]= i\\hbar\\,\\delta_{ij}$ and the classical field equations of gravitation. This {\\it in-principle} unavoidable change in the space-time metric destroys the commutativity (and hence locality) of position measurement operators.This essay argues that when measurement processes involve energies of the order of the Planck scale, the fundamental assumption of locality may no longer be a good approximation. Idealized position measurements of two distinguishable spin-$0$ particles are considered. The measurements alter the space-time metric in a fundamental manner governed by the commutation relations $[x_i\\,\\,p_j]= i\\hbar\\,\\delta_{ij}$ and the classical field equations of gravitation. This {\\it in-principle} unavoidable change in the space-time metric destroys the commutativity (and hence locality) of position measurement operators.

Jan 1, 1994126 citations

Quantum Measurement and Gravity for Each Other

Lajos Diósi

Springer eBooksJan 1, 199213 citations

Hybrid classical-quantum Newtonian gravity with stable vacuum

Nicolò Piccione, Angelo Bassi

Abstract 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 based on continuous weak measurement schemes, we show that GPSL ensures vacuum stability; this, together with its applicability to identical particles and fields, makes it a promising candidate for a relativistic generalization. We analyze the model’s general properties, and compare its predictions with those based on continuous weak measurement schemes. Notably, here the gravitational feedback enters entirely through the non-Hermitian jump operators, without modifying the unitary part of the dynamics. We show that this leads to a short-range gravitational back-reaction and permits decoherence rates below those of any model based on continuous weak measurement schemes. We provide explicit examples, including the dynamics of a single particle and a rigid sphere, to illustrate the distinctive phenomenology of the model. Finally, we discuss the experimental testability of GPSL, highlighting both interferometric and non-interferometric strategies to constrain its parameters and distinguish it from competing models.Abstract 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 based on continuous weak measurement schemes, we show that GPSL ensures vacuum stability; this, together with its applicability to identical particles and fields, makes it a promising candidate for a relativistic generalization. We analyze the model’s general properties, and compare its predictions with those based on continuous weak measurement schemes. Notably, here the gravitational feedback enters entirely through the non-Hermitian jump operators, without modifying the unitary part of the dynamics. We show that this leads to a short-range gravitational back-reaction and permits decoherence rates below those of any model based on continuous weak measurement schemes. We provide explicit examples, including the dynamics of a single particle and a rigid sphere, to illustrate the distinctive phenomenology of the model. Finally, we discuss the experimental testability of GPSL, highlighting both interferometric and non-interferometric strategies to constrain its parameters and distinguish it from competing models.

arXiv:2502.04996Classical and Quantum GravityOct 20, 20252 citations

Quantum Optics, Experimental Gravitation, and Measurement Theory

R. Loudon

Optica Acta International Journal of OpticsSep 1, 1984246 citations

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particles are considered. The measurements alter the space-time metric in a fundamental manner governed by the commutation relations

[x_i\\,\\,p_j]= i\\hbar\\,\\delta_{ij}

and the classical field equations of gravitation. This {\\it in-principle} unavoidable change in the space-time metric destroys the commutativity (and hence locality) of position measurement operators.