Method to deterministically generate large-amplitude optical cat states

TL;DR

This paper introduces a deterministic method for generating large-amplitude optical cat states using interaction-free measurement and the quantum Zeno effect, protecting quantum properties and tolerating photon loss.

Contribution

The authors propose a novel approach combining interaction-free measurement and the quantum Zeno effect to deterministically produce large optical cat states while maintaining quantum coherence.

Findings

Method enables deterministic generation of large-amplitude cat states.

Quantum properties are preserved within a weak field environment.

High fidelity is achievable despite photon loss with low classical device losses.

Abstract

Cat states, as an important resource in the study of macroscopic quantum superposition and quantum information applications, have garnered widespread attention. To date, preparing large-sized optical cat states has remained challenging. We demonstrate that, by utilizing interaction-free measurement and the quantum Zeno effect, even a fragile quantum microscopic system can deterministically control and become entangled with strong light fields, thereby generating large-amplitude optical cat states. During the entire preparation process, our method ensures that the microscopic system functions within a weak field environment, so that its quantum property can be protected. Furthermore, we show that the preparation of cat states is possible even when the quantum microsystem suffers from significant photon loss, provided that optical losses from classical devices are kept low, which implies that the fidelity of the cat state can be enhanced by improvements to and the perfection of the classical optical system.