Digital quantum simulation of quantum gravitational entanglement with IBM quantum computers

We report the digital quantum simulation of a hamiltonian involved in the generation of quantum entanglement by gravitational means. In particular, we focus on a pair of quantum harmonic oscillators, whose interaction via a quantum gravitational field generates single-mode squeezing in both modes at the same time, a non-standard process in quantum optics. We perform a boson-qubit mapping and a digital gate decomposition specific for IBM quantum devices. We use error mitigation and post-selection to achieve high-fidelity, accessing a parameter regime out of direct experimental reach.

Automated summary

We report a digital quantum simulation of a hamiltonian that generates quantum entanglement through gravitational means. Specifically, we focus on a pair of quantum harmonic oscillators, which interact via a quantum gravitational field to produce single-mode squeezing simultaneously in both modes, a non-standard process in quantum optics. By employing a boson-qubit mapping and a digital gate decomposition tailored for IBM quantum devices, we mitigate errors and use post-selection to achieve high-fidelity simulations in a parameter regime that is beyond direct experimental reach.