Verifying entanglement with minimal measurements

Abstract

Entanglement witnesses (EWs) are a versatile tool to detect entangled states and also characterize the set of separable states. In this talk, I discuss a practical scenario of verifying entangled states and present cost-effective strategies for constructing and exploiting EWs. I show the minimal measurement setting of mutually biased bases (MUBs), the most experiment-friendly measurement that can be applied to quantum tomography in general, that can detect bound entangled states. I then present a brand new framework called EW 2.0 that upgrades the capabilities of existing EWs. Finally, a conjecture concerning EW 2.0 is addressed.