6 papers
Mass-Independent Gravitationally Induced Entanglement
Lorenzo Braccini, Alessio Serafini, Sougato Bose
We analytically solve the entangling quantum dynamics of two interacting Stern-Gerlach Interferometers~(SGI). Each SGI exploits an operator-valued force applied by a qubit to creat…
How "Quantum" is your Quantum Computer? Macrorealism-based Benchmarking via Mid-Circuit Parity Measurements
Ben Zindorf, Lorenzo Braccini, Debarshi Das +1
To perform meaningful computations, Quantum Computers (QCs) must scale to macroscopic levels - i.e., to a large number of qubits - an objective pursued by most quantum companies. H…
Nonclassicality of a Macroscopic Qubit-Ensemble via Parity Measurement Induced Disturbance
Lorenzo Braccini, Debarshi Das, Ben Zindorf +3
We propose an experimental scheme to test the nonclassicality of a macroscopic ensemble of qubits, through the violation of the classical notion of macrorealism (MR) via the fundam…
Superpositions of Quantum Gaussian Processes
Lorenzo Braccini, Sougato Bose, Alessio Serafini
We generalise the Gaussian formalism of Continuous Variable (CV) systems to describe their entanglement with Discrete Variable (DV) systems, leading to superpositions of CV Gaussia…
Exponential Expansion of Massive Schrödinger Cats for Sensing and Entanglement
Lorenzo Braccini, Alessio Serafini, Sougato Bose
Schrödinger cat states of levitated masses have several applications in sensing and, offer an avenue to explore the fundamental nature -- classical vs nonclassical -- of gravity, e…
Large Spin Stern-Gerlach Interferometry for Gravitational Entanglement
Lorenzo Braccini, Martine Schut, Alessio Serafini +2
Recently, there has been a proposal to test the quantum nature of gravity in the laboratory by witnessing the growth of entanglement between two masses in spatial quantum superposi…