Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 17: Ultracold plasmas and Rydberg systems II (with Q)

A 17.6: Vortrag

Dienstag, 1. März 2016, 15:45–16:00, f303

Quantum state tomography of a nano-mechanical oscillator using Rydberg atoms — •Adrián Sanz Mora, Sebastian Wüster, and Jan-Michael Rost — Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, 01187 Dresden, Germany

Rydberg atoms have proven to be an excellent tool to observe the quantum dynamical features of a microwave cavity mode[1]. Here we investigate their applicability to characterize instead the motional state of a nano-mechanical oscillator. Attaching a ferroelectric domain to the oscillator supplies it with a permanent electric dipole moment. Coupling between mechanical vibrations of such oscillator and a Rydberg transition dipole is thus enabled via an electric dipole-dipole interaction. Atomic Ramsey interference measurements of phase-shifts acquired by Rydberg atom-oscillator states in an off-resonance scenario provides a non-destructive detection of discrete mechanical quanta. Translations in phase space of the mechanical oscillator, required for its full tomographical reconstruction[2], are performed using the aforementioned coupling while the atoms are simultaneously driven by optical fields in an off-resonant Raman scenario. The Wigner function for a given initial motional state of the mechanical oscillator is recreated by applying several sequences of Ramsey measurements at many different sampling points in the phase space of the mechanical oscillator.

[1] S. Deléglise et al., Nature 455, 510 (2008).

[2] M.R. Vanner et al., Ann. Phys. 527, 15 (2014).