Macroscopic Quantum Superposition and Entanglement in light reflection from Bose-Einstein Condensates

TL;DR

This paper demonstrates the creation of macroscopic quantum superpositions and entanglement involving light and Bose-Einstein condensates through interaction with a quantum-injected optical parametric amplifier and a BEC mirror.

Contribution

It introduces a novel scheme to generate entangled macroscopic superpositions between single-photon states and BEC displacements using optical and matter-wave interactions.

Findings

Successful generation of macroscopic superpositions involving BEC and light.

Enhanced effects with cavity or interferometer configurations.

Potential for space-like separated entanglement between microscopic and macroscopic states.

Abstract

The multiphoton quantum superposition generated by a quantum-injected optical parametric amplifier (QI-OPA) seeded by a single-photon belonging to an EPR entangled pair is made to interact with a Mirror-BEC shaped as a Bragg interference structure. The effect can be greatly enhanced if the mirror is part of a cavity structure or is used within an optical interferometer. The overall process will realize an Entangled Macroscopic Quantum Superposition involving a ''microscopic'' singe-photon state of polarization and the coherent ''macroscopic'' displacement of the BEC structure acting in space-like separated distant places.