> FWIU, there are various types of quantum entropy; entanglement and non-entanglement entropy. Quantum discord [2]:
>> In quantum information theory, quantum discord is a measure of nonclassical correlations between two subsystems of a quantum system. It includes correlations that are due to quantum physical effects but do not necessarily involve quantum entanglement.
> "Designing three-way entangled and nonlocal two-way entangled single particle states via alternate quantum walks" (2024) https://arxiv.org/abs/2402.05080 :
>> Herein, we generate three-way entanglement from an initially separable state involving three degrees of freedom of a quantum particle, which evolves via a 2D alternate quantum walk employing a resource-saving single-qubit coin. We achieve maximum possible values for the three-way entanglement quantified by the π-tangle between the three degrees of freedom. We also generate optimal two-way nonlocal entanglement, quantified by the negativity between the nonlocal position degrees of freedom of the particle. This prepared architecture using quantum walks can be experimentally realized with a photon.
Isn't there more total entropy if there is n-way entanglement?
From https://news.ycombinator.com/context?id=39954180 and [2] https://en.wikipedia.org/wiki/Quantum_discord :
> FWIU, there are various types of quantum entropy; entanglement and non-entanglement entropy. Quantum discord [2]:
>> In quantum information theory, quantum discord is a measure of nonclassical correlations between two subsystems of a quantum system. It includes correlations that are due to quantum physical effects but do not necessarily involve quantum entanglement.
'Nonquantum entanglement'
From https://news.ycombinator.com/context?id=40302396 :
> "Nonquantum Entanglement Resolves a Basic Issue in Polarization Optics"
'Multi-particle entanglement'
From https://news.ycombinator.com/context?id=40281756 :
> "Designing three-way entangled and nonlocal two-way entangled single particle states via alternate quantum walks" (2024) https://arxiv.org/abs/2402.05080 :
>> Herein, we generate three-way entanglement from an initially separable state involving three degrees of freedom of a quantum particle, which evolves via a 2D alternate quantum walk employing a resource-saving single-qubit coin. We achieve maximum possible values for the three-way entanglement quantified by the π-tangle between the three degrees of freedom. We also generate optimal two-way nonlocal entanglement, quantified by the negativity between the nonlocal position degrees of freedom of the particle. This prepared architecture using quantum walks can be experimentally realized with a photon.
Isn't there more total entropy if there is n-way entanglement?