In this talk I will discuss several protocols designed for the verification and the characterization of quantum devices. In the first part of the talk I will focus on the purely classical verification of the output of a quantum computer and will present a minimal example for realizing such a verification protocol with current technology. In the second part I present experimentally accessible conditions for detecting entanglement
in mixed states. These conditions are based on the moments of the partial transposed density operator, which can be measured via local random measurements on single state copies (classical shadows).
J. Carrasco, A. Elben, Ch. Kokail, B. K., and P. Zoller (PRX Quantum 2021)
J. Carrasco, A. Elben, A. Neven, R. Kueng, B. Vermesch, V. Vitale, P. Calabrese, M. Dalmonte, B. K., P. Zoller, (2021)
A. Elben, R. Kueng, H.-Y. Huang, R. van Bijnen, Ch. Kokail, M. Dalmonte, P. Calabrese, B.K., J. Preskill, P. Zoller, B. Vermersch, PRL (19)