add vbe tutorial

Author: liwt31

README.md

@@ -99,5 +99,6 @@ which is also a good introduction to the software.
 
 ### Variational basis state encoder
 An efficient algorithm to encode phonon states in electron-phonon systems for quantum computation.
-See [examples](https://github.com/tencent-quantum-lab/TenCirChem/tree/master/example).
+See [examples](https://github.com/tencent-quantum-lab/TenCirChem/tree/master/example)
+and the [tutorial](https://tencent-quantum-lab.github.io/TenCirChem/tutorial_jupyter/vbe_tutorial_td.html).
 Reference paper: https://arxiv.org/pdf/2301.01442.pdf (published in PRR).

README_CN.md

@@ -96,6 +96,7 @@ TenCirChem 使用 Academic Public License 发布。
 
 ### 变分基矢编码器
 变分基矢编码器是编码电声子系统中的声子用以量子计算的高效算法。
-请参考[例子](https://github.com/tencent-quantum-lab/TenCirChem/tree/master/example).
+请参考[例子](https://github.com/tencent-quantum-lab/TenCirChem/tree/master/example)
+及[教程](https://tencent-quantum-lab.github.io/TenCirChem/tutorial_jupyter/vbe_tutorial_td.html)。
 参考论文: https://arxiv.org/pdf/2301.01442.pdf (发表于PRR).
 

docs/source/tutorial_jupyter/figs/vbe_gs_Fig1.svg

@@ -12,3 +12,5 @@ Tutorials
  tutorial_jupyter/noisy_simulation.ipynb
  tutorial_jupyter/sbm_dynamics.ipynb
  tutorial_jupyter/marcus.ipynb
+ tutorial_jupyter/vbe_tutorial_groundstate.ipynb
+ tutorial_jupyter/vbe_tutorial_td.ipynb

docs/source/tutorial_jupyter/figs/vbe_gs_Fig2.svg

@@ -16,8 +16,7 @@
 
 from tencirchem import set_backend, Op, Mpo, Model, OpSum
 from tencirchem.dynamic import get_ansatz, get_deriv, get_jacobian_func, qubit_encode_basis, sbm
-
-from vbe_lib import get_psi_indices, get_contracted_mpo, get_contract_args
+from tencirchem.applications.vbe_lib import get_psi_indices, get_contracted_mpo, get_contract_args
 
 set_backend("jax")