Heralded Generation of Macroscopic Superposition States in a Spinor Bose-Einstein Condensate

TL;DR

This paper proposes a method to generate large-scale macroscopic superposition states in a spinor Bose-Einstein condensate, leveraging the ground state's properties and heralded measurement, with all steps feasible with current technology.

Contribution

It introduces a novel scheme for creating macroscopic superpositions in spinor BECs using a protected ground state and heralded measurements, advancing quantum state engineering.

Findings

High probability of generating entangled superpositions

Ground state protected by energy gap, immune to phase noise

Feasible with current experimental techniques

Abstract

We propose to generate macroscopic superposition states of a large number of atoms in the ground state of a three-mode spinor Bose-Einstein condensate. The ground state is protected by a finite energy gap, is immune to phase noise, and the measurement of the number of particles in one mode heralds the coherent preparation of the two other modes simultaneously empty and filled. Highly entangled macroscopic superposition states are generated with large probability also taking into account quasi-adiabatic preparation of the ground state. All the key ingredients necessary to realize our proposal are experimentally available.