A method that projects out the ground state of a Hamiltonian and truncates the result back to the original operator basis yields an effective Hamiltonian whose ground state approximates the first excited state, demonstrated for H2 and partially for LiH.
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A Method of Determining Excited-States for Quantum Computation
A method that projects out the ground state of a Hamiltonian and truncates the result back to the original operator basis yields an effective Hamiltonian whose ground state approximates the first excited state, demonstrated for H2 and partially for LiH.