Five qubits can be entangled in how many ways?

Asked Apr 16 '22 at 20:04

Active Apr 17 '22 at 08:19

Viewed 199 times

It is well-known that there are two ways to entangle three qubits (https://arxiv.org/abs/quant-ph/0005115) and nine ways to entangle four qubits (https://arxiv.org/abs/quant-ph/0109033).

I found in a paper (page 22 left column of https://arxiv.org/abs/2101.02431) that there are infinitely many ways to entangle five qubits, but I am not sure how to see or prove this or if this is correct.

edited Apr 17 '22 at 08:19

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asked Apr 16 '22 at 20:04

R.G.J

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It is already infinitely many ways for four qubits. There is nine classes, but each has some continuous parameter on addition. – Norbert Schuch Apr 17 '22 at 09:10
Is there a proof for this assertion? – R.G.J Apr 17 '22 at 18:27
I think this is what the Verstraete paper says. – Norbert Schuch Apr 17 '22 at 19:05

Five qubits can be entangled in how many ways?

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