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Q: Fachverband Quantenoptik und Photonik
Q 36: Matter Wave Interferometry and Metrology I
Q 36.6: Vortrag
Mittwoch, 4. März 2026, 15:45–16:00, P 11
Vortex N00N states in ring lattices — •Lars Arne Schäfer1 and Reinhold Walser2 — 1Institut für Angewandte Physik, TU Darmstadt — 2Institut für Angewandte Physik, TU Darmstadt
We study a gas of few bosons in a ring trap that can be superimposed with a light-induced azimuthal lattice potential. Light sculpting permits almost arbitrary control of the potential [1]. We describe a technique that uses time-dependent variations of the lattice to create matter-wave vortex N00N states, where N particles are in an all-or-nothing superposition of two counter-rotating states. To do that, we load the gas adiabatically into the lattice, perform resonant state transfer by Bragg scattering between the interacting many-body eigenstates and release them adiabatically into the free ring. In a Sagnac interferometer, the resulting state can improve measurement precision beyond the standard quantum limit Δ θSQL to the Heisenberg limit Δ θHL = 1 / N.
[1] G. Gauthier, I. Lenton, N. McKay Parry, M. Baker, M. J. Davis, H. Rubinsztein-Dunlop, and T. W. Neely, Direct imaging of a digital-micromirror device for configurable microscopic optical potentials, Optica 3, 1136 (2016).
[2] L. Pezzè, A. Smerzi, M. K. Oberthaler, R. Schmied, and P. Treutlein, Quantum metrology with nonclassical states of atomic ensembles, Rev. Mod. Phys. 90, 035005 (2018).
Keywords: Bosonic gases; N00N states; Interferometry