# Questions tagged [two-level-system]

A quantum system that can exist in any quantum superposition of two independent (physically distinguishable) quantum states. Any two-state system can also be seen as a qubit.

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### Intuitive explanation for Rabi oscillations in a two-level system

Is there an intuitive explanation of why the Rabi oscillations with frequency $\Omega$ occur in a two-level systemand why they get faster when the transition dipole moment $M$ ($M\propto V$) gets ...
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### Approximation for two level system differential equations

I am currently reading the book "the quantum theory of light" link: http://rplab.ru/~as/2000%20-%20R.Loudon%20-%20The%20Quantum%20Theory%20of%20Light%20-%203rd%20ed%20Oxford%20Science%...
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### How to model a Josephson junction as a two-level atom?

I have seen people saying that under certain condition, the dynamics in the Josephson junction can be simplified to that of a two-level system, governed by a the following Hamiltonian which ...
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### Conservation of symmetrization in quantum mechanics

I recently read about the symmetrization requirement, which my book states is axiomatic of quantum mechanics: $$\psi(\mathbf r_1, \mathbf r_2) = \pm \psi(\mathbf r_2, \mathbf r_1). \tag{*}$$ It ...
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### Different formula to find $2\times 2$ Hamiltonian's eigenvalues [closed]
Consider the Hamiltonian $$\left[ \begin{matrix} E_1 & -A\\ -A& E_2\\ \end{matrix} \right]$$ where $A$, $E_1,E_2$ are real numbers. I have seen a different formula to ...