Digital quantum simulation of cosmological particle creation with IBM quantum computers

• URL: http://arxiv.org/abs/2410.02412v1
• Date: Thu, 3 Oct 2024 11:56:07 GMT
• Title: Digital quantum simulation of cosmological particle creation with IBM quantum computers
• Authors: Marco Díaz Maceda, Carlos Sabín,
• Abstract summary: We consider a system consisting of a minimally coupled massive quantum scalar field in a spacetime undergoing homogeneous and isotropic expansion. We simulate two vibration modes, positive and negative for a given field momentum, by devising a quantum circuit that implements the time evolution. We study the number of particles created after the universe expands at a given rate, both by simulating the circuit and by actual experimental implementation on IBM quantum computers.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We use digital quantum computing to simulate the creation of particles in a dynamic spacetime. We consider a system consisting of a minimally coupled massive quantum scalar field in a spacetime undergoing homogeneous and isotropic expansion, transitioning from one stationary state to another through a brief inflationary period. We simulate two vibration modes, positive and negative for a given field momentum, by devising a quantum circuit that implements the time evolution. With this circuit, we study the number of particles created after the universe expands at a given rate, both by simulating the circuit and by actual experimental implementation on IBM quantum computers, consisting of hundreds of quantum gates. We find that state-of-the-art error mitigation techniques are useful to improve the estimation of the number of particles and the fidelity of the state.

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