Published in

American Association for the Advancement of Science, Science, 6325(355), p. 620-623

DOI: 10.1126/science.aag1106

Links

Tools

Export citation

Search in Google Scholar

Deterministic entanglement generation from driving through quantum phase transitions

This paper is available in a repository.
This paper is available in a repository.

Full text: Download

Green circle
Preprint: archiving allowed
Green circle
Postprint: archiving allowed
Red circle
Published version: archiving forbidden
Data provided by SHERPA/RoMEO

Abstract

Many-body entanglement is often created through system evolution, aided by non-linear interactions between the constituting particles. The very dynamics, however, can also lead to fluctuations and degradation of the entanglement if the interactions cannot be controlled. Here, we demonstrate near-deterministic generation of an entangled twin-Fock condensate of $∼11000$ atoms by driving a $^{87}$Rb Bose-Einstein condensate undergoing spin mixing through two consecutive quantum phase transitions (QPTs). We directly observe number squeezing of $10.7±0.6$ dB and normalized collective spin length of $0.99±0.01$. Together, these observations allow us to infer an entanglement-enhanced phase sensitivity of $∼6$ dB beyond the standard quantum limit and an entanglement breadth of $∼910$ atoms. Our work highlights the power of generating large-scale useful entanglement by taking advantage of the different entanglement landscapes separated by QPTs. ; Comment: Supplementary materials can be found at http://science.sciencemag.org/content/355/6325/620/tab-figures-data