# Questions tagged [open-quantum-systems]

The study of open quantum systems is concerned with understanding and predicting the dynamics of quantum systems that are coupled significantly to their surroundings, leading to effects such as dissipation and decoherence.

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### Problem with an extra term in the von-Neumann equation

I have recently started studying quantum systems with mixed states, and I have come across with the von-Neumann equation. I could derive it by making the time derivative of the explicit form of the ...
1 vote
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### Stuck while deriving the Lindblad Master Equation

I was following Quantum Markov Processes from the book The Theory of Open Quantum Systems by Breuer and Petruccione. In the section The Markovian Quantum Master Equation they proceeds to 'construct ...
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In one of (the papers), I am reading on derivation of optimal conditions for photon antibunching, it is required to solve Schrodinger's equation using the following Hamiltonian (in the rotating frame) ...
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### Why in 2-level system can a diagonal lindblad equation be used to describe decay, when $|0\rangle$ and $|1\rangle$ aren't energy eigenstates anymore?

Citing Wikipedia (https://en.wikipedia.org/wiki/Lindbladian), the Lindblad equation takes the following form: \begin{align} {\displaystyle {\dot {\rho }}=-{\frac {\mathrm {i} }{\hbar }}[H,\rho ]+\sum ...
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### Factorization of density matrices

I'm currently reading through the following document about quantum noise and open quantum systems: https://courses.cs.washington.edu/courses/cse599d/06wi/lecturenotes13.pdf. On page 6 of the document, ...
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### Does the Davies secular equation apply to infinite dimensional systems?

The original Markovian Master Equations paper by Davies from 1974 seems to only go into the case of finite dimensions. Sources like Petruccione don't specify the dimension.
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### Why can we "wait for decay to the ground state quite generally"?

As it pertains to state preparation, but also quite generally, why should the method of waiting until decay to the ground state work at all? Ballentine writes "It is possible to prepare the ...
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### Confusion regarding the derivation of Lindblad master equation

I am reading theory of the master equation from Preskill's notes, section $3.5.2$. In the derivation, he writes In the case of an open quantum system, Markovian evolution for the infinitesimal time ...
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1 vote
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