Dynamic stabilization of a quantum many-body spin system

TL;DR

This paper demonstrates the dynamic stabilization of an unstable quantum many-body spin system using periodic phase manipulation, effectively controlling quantum fluctuations and stabilizing the system.

Contribution

It introduces a method of stabilizing an unstable quantum many-body system through periodic microwave pulses, validated by experimental stability diagrams and linear stability analysis.

Findings

Successful stabilization of a spin-1 Bose condensate using microwave pulses

Measured stability diagrams match theoretical linear stability predictions

Controlled quantum spin mixing and squeezing through dynamic stabilization

Abstract

We demonstrate dynamic stabilization of an unstable strongly interacting quantum many-body system by periodic manipulation of the phase of the collective states. The experiment employs a spin-1 atomic Bose condensate initialized to an unstable (hyperbolic) fixed point of the spin-nematic phase space, where subsequent free evolution gives rise to squeezing and quantum spin mixing. To stabilize the system, periodic microwave pulses are applied that manipulate the spin-nematic many-body fluctuations and limit their growth. The range of pulse periods and phase shifts for which the condensate can be stabilized is measured and the resulting stability diagram compares well with a linear stability analysis of the problem.