Singly-excited resonant open quantum system Tavis-Cummings model with quantum circuit mapping

TL;DR

This paper presents an analytical solution for the single-excitation Tavis-Cummings model with arbitrary atoms, introduces a quantum circuit mapping algorithm, and benchmarks its performance on quantum hardware.

Contribution

It provides a linear-complexity analytical solution and a novel quantum circuit mapping algorithm for the Tavis-Cummings model with multiple atoms.

Findings

The analytical solution scales linearly with the number of atoms.

The Q-MARINA algorithm effectively maps the model onto quantum circuits.

Benchmark results show robustness on quantum simulators and processors.

Abstract

Tavis-Cummings (TC) cavity quantum electrodynamical effects, describing the interaction of $N$ atoms with an optical resonator, are at the core of atomic, optical and solid state physics. The full numerical simulation of TC dynamics scales exponentially with the number of atoms. By restricting the open quantum system to a single excitation, typical of experimental realizations in quantum optics, we analytically solve the TC model with an arbitrary number of atoms with linear complexity. This solution allows us to devise the Quantum Mapping Algorithm of Resonator Interaction with $N$ Atoms (Q-MARINA), an intuitive TC mapping to a quantum circuit with linear space and time scaling, whose $N+1$ qubits represent atoms and a lossy cavity, while the dynamics is encoded through $2N$ entangling gates. Finally, we benchmark the robustness of the algorithm on a quantum simulator and superconducting quantum processors against the quantum master equation solution on a classical computer.