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Heralded Generation of Macroscopic Superposition States in a Spinor Bose-Einstein Condensate
L. Pezze', M. Gessner, P. Feldmann +3
We propose to generate macroscopic superposition states of a large number of atoms in the ground state of a three-mode spinor Bose-Einstein condensate. The ground state is protecte…
Phase magnification by two-axis countertwisting for detection noise robust interferometry
Fabian Anders, Luca Pezzè, Augusto Smerzi +1
Entanglement-enhanced atom interferometry has the potential of surpassing the standard quantum limit and eventually reaching the ultimate Heisenberg bound. The experimental progres…
Multipartite entanglement in topological quantum phases
Luca Pezzè, Marco Gabbrielli, Luca Lepori +1
We witness multipartite entanglement in the Kitaev chain -- a benchmark model of one dimensional topological insulator -- also with variable-range pairing, using the quantum Fisher…
Optimal measurements for simultaneous quantum estimation of multiple phases
Luca Pezzè, Mario A. Ciampini, Nicolò Spagnolo +6
A quantum theory of multiphase estimation is crucial for quantum-enhanced sensing and imaging and may link quantum metrology to more complex quantum computation and communication p…
Crossing Over from Attractive to Repulsive Interactions in a Tunneling Bosonic Josephson Junction
G. Spagnolli, G. Semeghini, L. Masi +9
We explore the interplay between tunneling and interatomic interactions in the dynamics of a bosonic Josephson junction. We tune the scattering length of an atomic K Bose-Ei…
Entanglement and squeezing in continuous-variable systems
Manuel Gessner, Luca Pezzè, Augusto Smerzi
We introduce a multi-mode squeezing coefficient to characterize entanglement in -partite continuous-variable systems. The coefficient relates to the squeezing of collective obse…