Preparing Greenberger-Horne-Zeilinger Entangled Photon Fock States of Three Cavities Coupled by a Superconducting Flux Qutrit

TL;DR

This paper presents a simplified method to generate GHZ entangled photon states across three cavities using a superconducting flux qutrit, avoiding classical pulses and measurements, thus reducing complexity and cost.

Contribution

It introduces a general, pulse-free approach for creating three-cavity GHZ states with various three-level systems, simplifying experimental implementation.

Findings

No classical pulses or measurements needed during operation

Applicable to different three-level physical systems

Reduces circuit complexity and cost

Abstract

We propose a way to prepare Greenberger-Horne-Zeilinger (GHZ) entangled photon Fock states of three cavities, by using a superconducting flux qutrit coupled to the cavities. This proposal does not require the use of classical microwave pulses and measurement during the entire operation. Thus, the operation is greatly simplified and the circuit engineering complexity and cost is much reduced. The proposal is quite general and can be applied to generate three-cavity GHZ entangled photon Fock states when the three cavities are coupled by a different three-level physical system such as a superconducting charge qutrit, a transmon qutrit, or a quantum dot.