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Superpositions of Gaussian Processes: Entanglement Sensing with Non-Gaussian Levitated Systems

The Gaussian formalism of continuous variables (CV), first developed in quantum optics, offers an operational and analytical framework suitable for theoretical analysis and experimental modelling of levitated systems.

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An analogous formalism based on superpositions of Gaussian processes can be constructed to describe CV systems interacting with qubits. We demonstrate this description by analysing non-Gaussian matter-wave interferometry that exploits the Stern-Gerlach (SG) coupling between a qubit and a levitated mass. The analytical solution of the quantum dynamics of two interacting SG interferometers shows that the entangling phase between the two qubits — generated by the leading-order gravitational interaction — is independent of the nanoparticle mass. The mass therefore represents a free experimental parameter that can be used to minimise noise, facilitating the search for non-classical phenomena of gravity in an experimental setting.

 

References: 

  • Superpositions of Quantum Gaussian Processes, L. Braccini, S. Bose, A. Serafini, 2025 (arXiv:2510.01156)
  • Mass-Independent Gravitationally Induced Entanglement, L. Braccini, A. Serafini, S. Bose, 2026 (arXiv:2602.19306)

Information

 

Speaker: Lorenzo Braccini (University College London)

Time:  14:00