fulqrum.ramps.ramps_open

ramps_open(QubitOperator H, Subspace target_subspace, double target_energy, unsigned int max_recursion=2, double tol=1e-12)

RAMPS restricted to an existing subspace when targeting a single bit-string and associated energy.

Parameters:

  • H (QubitOperator) – Hamiltonian

  • target_subspace (Subspace) – Target subspace to expand around

  • target_energy (double) – Target energy from target subspace

  • max_recursion (int) – Optional, maximum number of recursions to perform, default=2

  • tol (double) – Optional, tolerance value for truncation, default=1e-12

Returns:

RAMPS refined subspace

Return type:

Subspace