Entanglement, Quantum Correlators, and Connectivity in Graph States

Article Multidisciplinary Sciences

Entanglement and quantum correlation measures for quantum multipartite mixed states

Arthur Vesperini et al.

Summary: In this work, the authors propose a computable measure for the quantum correlation of multipartite mixed states, as well as a related measure for entanglement. These measures allow for the distinction between quantum correlation detached from entanglement and the one induced by entanglement. The effectiveness of the measures is demonstrated through testing on well-known states in the literature.

SCIENTIFIC REPORTS (2023)

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Article Physics, Multidisciplinary

Correlations and projective measurements in maximally entangled multipartite states

Arthur Vesperini

Summary: This paper investigates the structure of multipartite maximally entangled pure states by using tools with a simple and intuitive physical meaning, namely, projective measurements and correlations. It demonstrates the relation between post-measurement expectation values and pre-measurement correlations in such states. The consequences of this relation on the structure of the entanglement metric are inferred, and an upper bound for the persistency of entanglement is provided. The dependence of these features on the chosen measurement axis is emphasized, and optimization procedures are proposed to maximize the correlations. The procedures are applied to some prototypical examples.

ANNALS OF PHYSICS (2023)

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Article Optics

Multipartite stationary entanglement generation in the presence of dipole-dipole interaction in an optical cavity

Azar Vafafard et al.

Summary: This paper investigates the stationary and dynamics of entanglement in a system of dipole-coupled qubits interacting with a single-mode optical cavity in the strong coupling regime. The findings suggest that the entanglement can be induced and tuned by considering the dipole-dipole interaction between the qubits. Furthermore, the study highlights the importance of the dipole-dipole interaction intensity in determining the behavior of the entanglement.

PHYSICAL REVIEW A (2022)

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Article Physics, Multidisciplinary

Geometric measure of entanglement of multi-qubit graph states and its detection on a quantum computer

Kh P. Gnatenko et al.

Summary: The entanglement properties of multi-qubit graph states generated by controlled phase shift operators on separable quantum states were studied, revealing a dependence on the vertex degree, phase shift gate parameters, and state gate parameters. The quantified entanglement measure on the quantum computer ibmq_athens showed good agreement with analytical results.

EPL (2021)

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Article Physics, Multidisciplinary

Entanglement of graph states of spin system with Ising interaction and its quantifying on IBM's quantum computer

Kh P. Gnatenko et al.

Summary: Graph states generated by Ising Hamiltonian operators were studied to analyze the geometric measure of entanglement between a spin and other spins in the graph state. Using IBM Q Valencia, the quantum computations were in good agreement with theoretical results, indicating a relationship between the geometric measure of entanglement and the degree of the corresponding spin vertex in the graph.

PHYSICS LETTERS A (2021)

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Article Multidisciplinary Sciences

Entanglement protection of classically driven qubits in a lossy cavity

Alireza Nourmandipour et al.

Summary: Quantum technologies are developing to manipulate single quantum systems, with entanglement being a key resource for the quantum revolution. This paper investigates the effect of a classical driving field on the generation of entanglement between two qubits interacting with a bosonic environment, finding that the classical field plays a constructive role in protecting initial-state entanglement. The study shows that the classical driving field can drive a factorable initial-state into an entangled steady-state after interacting with the environment.

SCIENTIFIC REPORTS (2021)

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Article Optics