# The 27th International Conference on Atomic Physics

17-22 July 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

## Entanglement of the macroscopic spins of two spatially separated Bose-Einstein condensates

20 Jul 2022, 17:00
1h 30m
Hart House (Hart House)

### Hart House

#### Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Degenerate gases, many-body physics, and quantum simulation

### Speaker

Paolo Colciaghi (University of Basel)

### Description

We experimentally investigate the entanglement of two spatially separated many particle systems. Our experiments are based on a two component pseudo spin-$1/2$ Bose Einstein condensate of $^{87}$Rb on an atom chip. By engineering the interatomic interactions through state dependent trapping we are able to produce entangled spin-squeezed states in this system. Using coherent spin manipulations we split this entangled many-particle state into two halves in spin space and magnetic field gradients allow us to separate the two two-component BECs spatially by more than 40 $\mu$m. Our technique allows us to individually address the collective spins of the two BECs after splitting thereby realizing arbitrary spin measurements on the two systems. Their correlations allow to infer measurement results of non-commuting spin observables in one system from measurements on the other, demonstrating the entanglement of the two Bose-Einstein condensed clouds of roughly 800 atoms each. Besides the interest in understanding fundamental aspects of entanglement of many-body systems, our experiments enable new investigations in quantum enhanced metrology using spatially split probes.

Presenter name Paolo Colciaghi

### Primary authors

Paolo Colciaghi (University of Basel) Dr Yifan Li (University of Basel) Prof. Philipp Treutlein (University of Basel) Dr Tilman Zibold (University of Basel)

### Presentation Materials

There are no materials yet.