Generation of Pseudo-Random Quantum States on Actual Quantum Processors
The generation of a large amount of entanglement is a necessary condition for
a quantum computer to achieve quantum advantage. In this paper, we propose a
method to efficiently generate pseudo-random quantum states, for which the
degree of multipartite entanglement is nearly maximal. We argue that the method
is optimal, and use it to benchmark actual superconducting (IBM's ibm_lagos)
and ion trap (IonQ's Harmony) quantum processors. Despite the fact that
ibm_lagos has lower single-qubit and two-qubit error rates, the overall
performance of Harmony is better thanks to low error rate in state preparation
and measurement and to the all-to-all connectivity of qubits. Our result
highlights the relevance of the qubits network architecture to generate highly
entangled state.
Gabriele Cenedese Maria Bondani Dario Rosa Giuliano Benenti