Release Notes

0.3.0

New Features

• qiskit_addon_dice_solver.solve_fermion() now accepts CI strings directly as input to its first positional argument. Users may now specify their determinants with a bitstring matrix or CI strings.

Bug Fixes

• Fixed the select_cutoff value used in qiskit_addon_dice_solver.solve_fermion() to be the max 32-bit signed int value.

0.2.0

New Features

• Bitstrings are no longer limited to 80 bits. Bitstrings up to length 256 are now accepted.

• Open shell systems are now supported in qiskit_addon_dice_solver.solve_fermion() by setting the open_shell keyword argument to True. If set to True, the left and right halves of the input bitstrings may contain different hamming weights.

  Open shell systems are also supported in qiskit_addon_dice_solver.solve_hci(). Alpha and beta determinants are no longer expected to have the same hamming weights.

• Introduced a new function, qiskit_addon_dice_solver.solve_fermion(), which is intended to be compatible with qiskit-addon-sqd <https://qiskit.github.io/qiskit-addon-sqd/> workflows.

• Added a qiskit_addon_dice_solver.solve_hci() function, which behaves very similarly to qiskit_addon_dice_solver.solve_fermion() but provides a higher level of control over the behavior of the underlying Dice command line application.

Upgrade Notes

• Removed the qiskit_addon_dice_solver.solve_dice function. Users should call qiskit_addon_dice_solver.solve_fermion() instead.

• qiskit_addon_dice_solver.solve_hci() and qiskit_addon_dice_solver.solve_fermion() now return an qiskit_addon_sqd.fermion.SCIState instance to describe the ground state.