共面POVM的联合可测性
Joint measurability of coplanar POVMs
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- The University of Tokyo(东京大学)
- Tokai University(东海大学)
- Keio University(庆应义塾大学)
- RIKEN Center for Advanced Intelligence Project (AIP)(理化学研究所先进智能项目中心)
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中文总结 AI 辅助
本文证明共面布洛赫向量的POVM联合可测当且仅当凸包周长≤4,并肯定回答了相关猜想。
中文摘要 AI 辅助
无偏的量子比特正算子值测度(POVM)可以唯一地用布洛赫向量表示。我们证明,对于具有共面布洛赫向量的POVM,它们联合可测当且仅当布洛赫向量凸包的周长小于或等于4。此外,作为推论,我们对[Andrejic-Kunjwal 2020]提出的关于布洛赫向量位于同一圆上的POVM存在联合装置的猜想给出了肯定回答。
英文摘要
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.