Breeding the Cat Through Superposition of Two Schrodinger Kittens Based on Coupled Waveguides

TL;DR

This paper proposes a novel scheme to generate large optical Schrödinger's cat states by superposing two smaller cats in coupled waveguides, advancing quantum superposition control on integrated photonic chips.

Contribution

It introduces a new method to breed larger Schrödinger's cat states through superposition of two cats in coupled waveguides, surpassing previous amplitude limitations.

Findings

Demonstrates superposition of two SCs to produce larger states

Proposes a high-probability scheme for on-chip cat generation

Provides insights into quantum superposition in phase space

Abstract

Optical Schrodinger's cat (SC) is highly anticipated because of the potential of realizing fault-tolerant quantum computing, but the practical merit is only shown when the amplitude is larger than 2. However, such high-amplitude cats have not been prepared due to the limitations rooted in the existing method. Here, we demonstrate a principle that a large SC-like state can be generated by the superposition of two kittens in which two nearby coherent states interfere and grow to an enlarged coherent-like state. Further, we propose a scheme to breed the cat beyond the limitation in the former works with a high probability by realizing the superposition of two SCs in coupled waveguides. The principle and scheme demonstrated here provide a new perspective on understanding quantum superposition in phase space and a better solution for the efficient generation of SCs on chips.