Entanglement measures in embedding quantum simulators with nuclear spins
Tao Xin, Julen Simon Pedernales, E. Solano, Gui‐Lu Long · Physical Review A · 2018
We implement an embedding quantum simulator (EQS) in nuclear spin systems. The experiment consists of a simulator of up to three qubits, plus a single ancillary qubit, where we are able to efficiently measure the concurrence and the three-tangle of two-qubit and three-qubit systems as they undergo entangling dynamics. The EQS framework allows us to drastically reduce the number of measurements needed for this task, which otherwise would require full-state reconstruction of the qubit system. Our simulator is built of the nuclear spins of four $^{13}\mathrm{C}$ atoms in a molecule of trans-crotonic acid manipulated with NMR techniques.