Correspondence between entangled states and entangled bases under local transformations

• URL: http://arxiv.org/abs/2301.13285v2
• Date: Thu, 29 Jun 2023 15:21:37 GMT
• Title: Correspondence between entangled states and entangled bases under local transformations
• Authors: Florian Pimpel, Martin J. Renner and Armin Tavakoli
• Abstract summary: We prove that for bipartite states with a local dimension that is either $2, 4$ or $8$, every state corresponds to a basis. For some states of four qubits we are unable to find a basis, leading us to conjecture that not all quantum states admit a corresponding measurement.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate whether pure entangled states can be associated to a measurement basis in which all vectors are local unitary transformations of the original state. We prove that for bipartite states with a local dimension that is either $2, 4$ or $8$, every state corresponds to a basis. Via numerics we strongly evidence the same conclusion also for two qutrits and three qubits. However, for some states of four qubits we are unable to find a basis, leading us to conjecture that not all quantum states admit a corresponding measurement. Furthermore, we investigate whether there can exist a set of local unitaries that transform \textit{any} state into a basis. While we show that such a state-independent construction cannot exist for general quantum states, we prove that it does exist for real-valued $n$-qubit states if and only if $n=2,3$, and that such constructions are impossible for any multipartite system of an odd local dimension. Our results suggest a rich relationship between entangled states and iso-entangled measurements with a strong dependence on both particle numbers and dimension.

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