Maximally entangling tripartite protocols for Josephson phase qubits

TL;DR

This paper presents straightforward protocols to generate tripartite GHZ and W entangled states in systems with anisotropic exchange interactions, specifically applied to Josephson phase qubits with capacitive and inductive couplings.

Contribution

It introduces simple entangling protocols tailored for anisotropic exchange interactions, expanding the methods for creating tripartite entanglement in superconducting qubits.

Findings

Protocols successfully generate GHZ and W states.

Applicable to Josephson phase qubits with capacitive and inductive couplings.

Demonstrates feasibility of macroscopic entanglement in these systems.

Abstract

We introduce a suit of simple entangling protocols for generating tripartite GHZ and W states in systems with anisotropic exchange interaction g(XX+YY)+g'ZZ. An interesting example is provided by macroscopic entanglement in Josephson phase qubits with capacitive (g'=0) and inductive (0<|g'/g|<0.1) couplings.