Genuine multipartite entanglement measures based on multi-party teleportation capability

TL;DR

This paper introduces new multipartite entanglement measures based on three-party teleportation capability, emphasizing their usefulness in quantum information processing and extending them to larger systems.

Contribution

The paper proposes novel entanglement measures rooted in multi-party teleportation capability, satisfying key criteria and applicable to systems with three or more qubits.

Findings

Measures satisfy entanglement criteria

Applicable to three-qubit systems

Extended to N-qubit systems

Abstract

Quantifying entanglement is vital to understand entanglement as a resource in quantum information processing, and many entanglement measures have been suggested for this purpose. When mathematically defining an entanglement measure, we should consider the distinguishability between entangled and separable states, the invariance under local transformation, the monotonicity under local operations and classical communication, and the convexity. These are reasonable requirements but may be insufficient, in particular when taking into account the usefulness of quantum states in multi-party quantum information processing. Therefore, if we want to investigate multipartite entanglement as a resource, then it can be necessary to consider the usefulness of quantum states in multi-party quantum information processing when we define a multipartite entanglement measure. In this paper, we define new multipartite entanglement measures for three-qubit systems based on the three-party teleportation capability, and show that these entanglement measures satisfy the requirements for being genuine multipartite entanglement measures. We also generalize our entanglement measures for $N$-qubit systems, where $N \ge 4$, and discuss that these quantities may be good candidates to measure genuine multipartite entanglement.