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Q: Fachverband Quantenoptik und Photonik

Q 13: Ultracold Matter (Bosons) I (joint session Q/A)

Q 13.4: Talk

Monday, March 10, 2025, 17:45–18:00, HS I PI

Matter-wave vortex N00N states by resonant excitation — •Lars Arne Schäfer and Reinhold Walser — TU Darmstadt, Germany

We study a gas of few interacting bosons in a ring trap that is superimposed with a freely programmable periodic azimuthal potential [1]. This highly controllable quantum system has been proposed as a platform for quantum simulation and sensing [2]. In contrast to angular momentum transfer from Gauss-Laguerre laser beams [3], we describe techniques to use the time-dependent programmable lattice potential. This will induce resonant excitations between angular momentum Fock states in the ring trap. As a specific application, we discuss the creation of the entangled N00N state | ψ⟩= 1√2 ( |2_-p, 0_p ⟩+ | 0_-p, 2_p ⟩), where the two modes are angular momentum eigenstates with k_{± p}.

• [1] M. R. Sturm, M. Schlosser, R. Walser, and G. Birkl, Quantum simulators by design: Many-body physics in reconfigurable arrays of tunnel-coupled traps, Phys. Rev. A 95, 063625 (2017).
• [2] L. Amico et al., Quantum Many Particle Systems in Ring-Shaped Optical Lattices, Phys. Rev. Lett. 95, 063201 (2005).
• [3] G. Nandi, R. Walser, and W. P. Schleich, Vortex creation in a trapped Bose-Einstein condensate by stimulated Raman adiabatic passage, Phys. Rev. A 69, 063606 (2004).

Keywords: few-particle systems; coherent control