# Questions tagged [quasiprobability-distributions]

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### Is there a simple way to obtain the Quantum Fisher Information (QFI) from a Wigner function? (or any other quasiprobability distribution?)

In theory the Wigner function $W(q,p)$ contains all the same information as the density matrix $\rho$ associated with it, so it's definitely possible to write the QFI $\mathcal F_Q$ in terms of the ...
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### Wigner function in relation to real space

The Wigner function is a quasi-probability distribution because it can have values of $x$ from -1,0,+1. As it is orthogonal to the $x,p$ plane can this be represented as a dipole moment along the $z$ ...
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### Can the lifetime of a broken covalent bond be calculated?

According to a paper (molecular dynamic simulation) published in 2018,(https://www.scirp.org/journal/paperinformation.aspx?paperid=83351) the Maxwell-Boltzman distribution is also valid for the number ...
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### What does it mean for $P$ functions to be "more singular than a delta"?

Consider the Glauber-Sudarshan $P$ representation of a state $\rho$, which is the function $\mathbb C\ni\alpha\mapsto P_\rho(\alpha)\in\mathbb R$ such that \rho = \int d^2\alpha \, P_\rho(\alpha) |\...
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### Understanding the relationship between Phase Space Distributions (Wigner vs Glauber-Sudarshan P vs Husimi Q)

I am moving into a new field and after thorough literature research need help appreciating what is out there. In the continuos variable formulation of optical state space. (Quantum mechanical/Optical) ...
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### What is the physical interpretation of the density matrix in a double continuous basis $|\alpha\rangle$, $|\beta\rangle$?

(a) Any textbook gives the interpretation of the density matrix in a single continuous basis $|\alpha\rangle$: The diagonal elements \$\rho(\alpha, \alpha) = \langle \alpha |\hat{\rho}| \alpha \...
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