Add H2 Hamiltonian coefficients dataset, fixup VQE notebook

Author: karalekas

notebooks/BellStateTomography.ipynb

@@ -61,7 +61,6 @@
    "outputs": [],
    "source": [
     "qubits = (0, 1)\n",
-    "# fewer shots so it runs faster\n",
     "shots = 500\n",
     "qc = get_qc(\"2q-noisy-qvm\")"
    ]

notebooks/QuantumWalk.ipynb

@@ -41,7 +41,6 @@
    "outputs": [],
    "source": [
     "q0, q1 = (0, 1)\n",
-    "# fewer shots so it runs faster\n",
     "shots = 500\n",
     "gammas = np.linspace(-np.pi / 2, np.pi / 2, 100)\n",
     "qc = get_qc(\"2q-noisy-qvm\")"

notebooks/ReadoutErrorMitigation.ipynb

@@ -0,0 +1,55 @@
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