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Updated documentation in the mastereq.py
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foxfixfax committed Jan 8, 2024
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"In this tutorial we will go over the steps needed to simulate the decoherence of a central spin coupled to a dissipative, interacting spin baths governed by Lindblad Master equation using CCE method (ME-CCE) within the **PyCCE** module. Two methods of interest include:\n",
"\n",
"* Master Equation CCE (ME-CCE).\n",
"* Master Equation gCCE (ME-gCCE).\n",
"\n",
"$\\newcommand{\\bra}[1]{\\left\\langle {#1} \\right|}$\n",
"$\\newcommand{\\ket}[1]{\\left| {#1} \\right\\rangle}$\n",
"$\\newcommand{\\Tr}{\\mathrm{Tr}}$"
"* Master Equation gCCE (ME-gCCE)."
]
},
{
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"\n",
"where $\\hat \\rho$ is the density matrix of the system, $\\hat H$ is the Hamiltonian, and $\\hat L_i$ are jump operators with corresponding dissipation rates $\\gamma_i$.\n",
"\n",
"Within the conventional CCE framework, the coherence of the central spin is recovered from the trace of the partial inner product $\\hat \\rho_{01} (t) =\\bra{0}\\hat \\rho (t)\\ket{1}$ as $\\mathcal{L}(t)=\\Tr [\\hat \\rho_{01} (t)]/\\Tr [\\hat \\rho_{01} (0)]$. The evolution of $\\hat \\rho_{01}$ by solving the following:\n",
"Within the conventional CCE framework, the coherence of the central spin is recovered from the trace of the partial inner product $\\hat \\rho_{01} (t) =\\left\\langle {0} \\right|\\hat \\rho (t)\\left| {1} \\right\\rangle$ as $\\mathcal{L}(t)=\\Tr [\\hat \\rho_{01} (t)]/\\Tr [\\hat \\rho_{01} (0)]$. The evolution of $\\hat \\rho_{01}$ by solving the following:\n",
"\n",
"\\begin{equation}\n",
" \\frac{d}{dt} \\hat \\rho_{01} (t) = \\mathfrak{I} \\cdot \\hat \\rho_{01} (t)= -\\frac{i}{\\hbar} \\hat H^{(0)} \\hat \\rho_{01}(t) + \\frac{i}{\\hbar} \\hat \\rho_{01}(t) \\hat H^{(1)} + \\sum_i{\\gamma_i (\\hat L_i \\hat \\rho \\hat L_i^\\dagger - \\frac{1}{2}\\{\\hat L_i^\\dagger \\hat L_i, \\hat \\rho \\})},\n",
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"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.11.5"
"version": "3.9.13"
}
},
"nbformat": 4,
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