I understand an arbitrary unitary matrix cannot be always written in a tensor product of 2x2 matrices. But, if a unitary matrix meets some conditions, can it be done? If so, what are those conditions?
2026-02-23 09:14:47.1771838087
What are the sufficient and necessary conditions for a unitary matrix to be written in a tensor product of 2x2 matrices?
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The paper Criterion of Local Unitary Equivalence for Multipartite States answers your question.