Signature of entangled eigenstates in the magnetic response of two coupled flux qubits

TL;DR

This paper demonstrates that the magnetic response measured via impedance technique reveals the formation of entangled eigenstates in two coupled flux qubits, providing a method to detect entanglement through magnetic measurements.

Contribution

It introduces a novel approach linking magnetic response differences to the presence of entangled eigenstates in coupled flux qubits.

Findings

IMT deficit indicates entangled eigenstates formation.

Magnetic response differences serve as signatures of entanglement.

The study connects impedance measurements with quantum entanglement detection.

Abstract

We study dissipative dynamics and a magnetic response of two coupled flux qubits interacting with a high quality tank in the framework of the impedance measurement technique (IMT). It is shown that the observation of the difference between a sum of IMT signals from separated qubits and the signal from the system when both qubits are in the degeneracy point (IMT deficit) implies immediately a formation of the entangled two-qubit eigenstates.