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Quantum computers promise to efficiently solve important problems that areintractable on a conventional computer. Quantum computational algorithms havethe potential to be an exciting new way of studying quantum cosmology. Inquantum cosmology, we learn about the dynamics of the universe withoutconstructing a complete theory of quantum gravity. Since the universalwavefunction exists in an infinite-dimensional superspace over all possible 3Dmetrics and modes of matter configurations, we take minisuperspaces for ourwork by constraining the degrees of freedom to particular 3D metrics anduniform scalar field configurations. Here, we consider a wide variety ofcosmological models. We begin by analyzing an anisotropic universe withcosmological constant and classical radiation. We then study the results forhigher derivatives, Kaluza-Klein theories and string dilaton in quantumcosmology. We use IBM's Quantum Information Science Kit (QISKit) python libraryand the Variational Quantum Eigensolver (VQE) algorithm for studying thesesystems. The VQE algorithm is a hybrid algorithm that uses the variationalapproach and interleaves quantum and classical computations in order to findthe minimum eigenvalue of the Hamiltonian for a given system.

Demonstration of Minisuperspace Quantum Cosmology Using Quantum Computational Algorithms on IBM Quantum Computer