We are pleased to announce that we have updated our paper &#34;<a href="https://arxiv.org/abs/2105.01141" rel="noopener noreferrer" target="_blank">[2105.01141] Tangent Vector Variational Quantum Eigensolver: A Robust Variational Quantum Eigensolver against the inaccuracy of derivative (arxiv.org)</a>&#34;, which I co-authored with my colleague, has been updated. There are three updates as follows. 1, Fig. 1-3 have been updated. Fixed an error in the caption. 2, The relation between convergence to the exact solution of TVVQE and the tangent vector size is now shown in Figs. 4-6. I also added a discussion about them. 3, I included the details of each method in the comparison of various methods in Chapter 4 as an appendix.

Anouncement of update of our paper.

Hikaru Wakaura