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Observation of Entangled States of a Fully Controlled 20-Qubit System · Around

2017

Observation of Entangled States of a Fully Controlled 20-Qubit System

Friis, Nicolai, Marty, Oliver, Maier, Christine et al.

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We generate and characterise entangled states of a register of 20 individually controlled qubits, where each qubit is encoded into the electronic state of a trapped atomic ion.

Entanglement is generated amongst the qubits during the out-of-equilibrium dynamics of an Ising-type Hamiltonian, engineered via laser fields.
Since the qubit-qubit interactions decay with distance, entanglement is generated at early times predominantly between neighbouring groups of qubits.
We characterise entanglement between these groups by designing and applying witnesses for genuine multipartite entanglement.

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