Mutually unbiased measurement based entanglement witnesses

4 Dec 2019  ·  Tao Li, Le-Min Lai, Shao-Ming Fei, Zhi-Xi Wang ·

We study entanglement witness and present a construction of entanglement witnesses in terms of the mutually unbiased measurements (MUMs). These witnesses include the entanglement witnesses constructed from mutually unbiased bases (MUBs) as a special case. Comparing with the dimension dependence of MUBs, the witnesses can be always constructed from a complete set of $d+1$ MUMs for any dimension $d$. We show that our witness can detect entanglement better than previous separability criterion given also by MUMs. And the approach can be experimentally implemented.

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Quantum Physics