Entanglement distance for arbitrary $M$-qudit hybrid systems

Abstract

The achievement of quantum supremacy boosted the need for a robust medium of quantum information. In this task, higher-dimensional qudits show remarkable noise tolerance and enhanced security for quantum key distribution applications. However, to exploit the advantages of such states, we need a thorough characterisation of their entanglement. Here, we propose a measure of entanglement which can be computed either for pure and mixed states of a $M$-qudit hybrid system. The entanglement measure is based on a distance deriving from an adapted application of the Fubini-Study metric. This measure is invariant under local unitary transformations and has an explicit computable expression that we derive. In the specific case of $M$-qubit systems, the measure assumes the physical interpretation of an obstacle to the minimum distance between infinitesimally close states. Finally, we quantify the robustness of entanglement of a state through the eigenvalues analysis of the metric tensor associated with it.

arXiv commentarXiv admin note: substantial text overlap with arXiv:1908.03117

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• Correlations and projective measurements in maximally entangled multipartite states
• Entanglement in Quantum Systems Based on Directed Graphs
• A Sharp Geometric Measure of Entanglement
• Entanglement Protection of Classically Driven Qubits in a Lossy Cavity