*Title: Quantum Simulation (for cosmology?) [#e5284759]

**Speaker: Soichiro Hashiba [#wad9eda2]

Quantum computing is one of the most rapidly progressing fields in science. Nowadays, quite a few people try to use quantum computers in cosmology. The most straightforward use of quantum computer is the quantum simulation by which we can simulate (in other words, make analogy experiments of) quantum phenomena in the early Universe. In this talk, I will explain the concept of quantum simulation [1] and show some primitive examples [2,3]. Current quantum computers, however, are too noisy for practical simulations. Therefore, I will also give a brief explanation of a quantum-classical hybrid method called the variational quantum eigensolver (VQE) [4] and recent examples of its application for cosmology [5,6].

[1] M. Nielsen and I. Chuang, “Quantum Computation and Quantum Information”, Cambridge University Press (2000).
[2] C. Argüelles and B. Jones, Phys. Rev. Res. 1, 033176 (2019).
[3] B. Hall, A. Roggero, A. Baroni and J. Carlson, 2102.12556 [quant-ph].
[4] A. Peruzzo et al., Nat. Commun. 5, 4213 (2014).
[5] J. Stecenko, Y. Feng and M. McGuigan, 2105.02032 [quant-ph].
[6] A. Joseph et al., 2105.13849 [quant-ph].

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