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arXiv · 2609.38836

Joint measurability of coplanar POVMs

Taro Yoshino·Koichi Tojo·Kei Hagihara·Akinori Tanaka·Takuki Tomita
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Abstract

An unbiased qubit positive operator-valued measure (POVM) can be uniquely expressed in terms of the Bloch vector. We prove that for POVMs with coplanar Bloch vectors, they are jointly measurable if and only if the perimeter of the convex closure of Bloch vectors is less than or equal to 4. Moreover, as a corollary, we give an affirmative answer to the conjecture suggested by [Andrejic-Kunjwal 2020] on the existence of a joint device for POVMs whose Bloch vectors lie on the same circle.

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Taro Yoshino, Koichi Tojo, Kei Hagihara, Akinori Tanaka, Takuki Tomita. 2026-09-30. Joint measurability of coplanar POVMs. https://arxiv.org/abs/2609.38836

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