Variational quantum simulation of long-range interacting systems

Understand

Current quantum simulators suffer from multiple limitations such as short coherence time, noisy operations, faulty readout and restricted qubit connectivity in some platforms.

• Variational quantum algorithms are the most promising approach in near-term quantum simulation to achieve practical quantum advantage over classical computers.
• Here, we explore variational quantum algorithms, with different levels of qubit connectivity, for digital simulation of the ground state of long-range interacting systems as well as generation of spin squeezed states.
• We find that as the interaction becomes more long-ranged, the variational algorithms become less efficient, achieving lower fidelity and demanding more optimization iterations.