Schr\"odinger's cat state of optical parallel universes

TL;DR

This paper proposes experimental schemes using optical interferometry to realize and explore superpositions of parallel universes, potentially enabling laboratory detection of such phenomena.

Contribution

It introduces two feasible experimental setups to create and investigate Schr"odinger's cat states of optical parallel worlds.

Findings

Proposed a Mach-Zehnder interferometer-based method for parallel universe detection.

Demonstrated the feasibility of creating superpositions of optical parallel worlds in laboratory conditions.

Provided theoretical frameworks for realizing Schr"odinger's cat states of parallel universes.

Abstract

Parallel worlds are imaginative ideas in quantum mechanics and cosmology. The superpositions of parallel worlds are novel states of quantum gravity and have no classical correspondences generally. In this letter, we investigate the superposition or the Schr\"odinger's cat state of optical parallel worlds, which could be realized in laboratory and may shed some light on the detection of parallel universes in a real world. We propose two realizable experimental schemes, which enable to explore the mysterious `parallel universes' by a Mach-Zehnder interferometer. The first one is based on an atomic ensemble in a superposition state, which is a fat Schr\"odinger's cat state. The second one is to prepare a photon in a superposition of different paths, where each path lies in an optical parallel universe.