Digital quantum simulations of scattering in quantum field theories using W states

• URL: http://arxiv.org/abs/2505.03111v1
• Date: Tue, 06 May 2025 02:07:04 GMT
• Title: Digital quantum simulations of scattering in quantum field theories using W states
• Authors: Roland C. Farrell, Nikita A. Zemlevskiy, Marc Illa, John Preskill,
• Abstract summary: Evidence for inelastic particle production is observed in one-dimensional Ising field theory using IBM's quantum computers.<n>New quantum algorithm for preparing the initial state (wavepackets) of a quantum field theory scattering simulation.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: High-energy particle collisions can convert energy into matter through the inelastic production of new particles. Quantum computers are an ideal platform for simulating the out-of-equilibrium dynamics of the collision and the formation of the subsequent many-particle state. In this work, evidence for inelastic particle production is observed in one-dimensional Ising field theory using IBM's quantum computers. The scattering experiment is performed on 100 qubits of ibm_marrakesh and uses up to 6,412 two-qubit gates to access the post-collision dynamics. Integral to these simulations is a new quantum algorithm for preparing the initial state (wavepackets) of a quantum field theory scattering simulation. This method efficiently prepares wavepackets by extending recent protocols for creating W states with mid-circuit measurement and feedforward. The required circuit depth is independent of wavepacket size and spatial dimension, representing a superexponential improvement over previous methods. Our wavepacket preparation algorithm can be applied to a wide range of lattice models and is demonstrated in one-dimensional Ising field theory, scalar field theory, the Schwinger model, and two-dimensional Ising field theory.

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