## Learn to Use ITensor

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# Exactly Compute Ground State of a Small Hamiltonian

As a test for more scalable codes, it is often useful to work in the full Hilbert space and exactly find the ground state of the Hamiltonian of a small system.

Below is a code that initializes a random wavefunction as a single ITensor, then applies $e^{-\tau\, H}$ a few times to this ITensor wavefunction to obtain the ground state.