Clapeyron's theorem (elasticity): Difference between revisions

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In [[quantum mechanics]], and especially [[quantum information| quantum information theory]], the '''linear entropy'''  or '''impurity''' of a [[quantum state|state]] is a [[scalar (physics)|scalar]] defined as


:<math>S_L \, \dot= \, 1 - \mbox{Tr}(\rho^2) \,</math>


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where ''ρ'' is the [[density matrix]] of the state.


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The linear entropy can range between zero, corresponding to a completely pure state, and (1 − 1/''d''), corresponding to a completely mixed state. (Here, ''d'' is the [[dimension]] of the density matrix.)


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The linear entropy is trivially related to the [[purity (quantum mechanics)|purity]] <math>\gamma \,</math> of a state by
:<math>S_L \, = \, 1 - \gamma \, .</math>


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==Motivation==
 
The linear entropy is a lower approximation to the (quantum) [[von Neumann entropy]] ''S'', which is defined as
 
:<math>S \, \dot= \, -\mbox{Tr}(\rho \ln \rho) = -\langle \ln \rho  \rangle \, .</math>
 
The linear entropy then is obtained by expanding ln ''ρ'' = ln (1−(1−''ρ'')), around a pure state, ''ρ''<sup>2</sup>=''ρ''; that is, expanding in terms of the non-negative matrix 1−''ρ'' in the formal  [[Mercator series]] for the logarithm,
:<math> - \langle \ln \rho  \rangle =  \langle 1- \rho  \rangle    + \langle (1- \rho )^2 \rangle/2    +  \langle (1- \rho)^3  \rangle /3  + ...  ~,</math>
and retaining just the leading term.
 
The linear entropy and von Neumann entropy are similar measures of the degree of mixing  of a state, although the linear entropy is easier to calculate, as it does not require [[Diagonalizable matrix|diagonalization]] of the density matrix.
 
==Alternate definition==
Some authors<ref>{{cite journal | author=Nicholas A. Peters, Tzu-Chieh Wei, Paul G. Kwiat|title = Mixed state sensitivity of several quantum information benchmarks| year=2004 |journal = Physical Review A|volume=70|pages=052309 | doi=10.1103/PhysRevA.70.052309|arxiv = quant-ph/0407172 |bibcode = 2004PhRvA..70e2309P | issue=5}}</ref> define linear entropy with a different normalization
:<math>S_L \, \dot= \, \tfrac{d}{d-1} (1 - \mbox{Tr}(\rho^2) ) \, ,</math>
which ensures that the quantity ranges from zero to unity.
 
==References==
<references/>
 
[[Category:Quantum mechanics]]
[[Category:Quantum mechanical entropy]]
 
 
{{quantum-stub}}

Revision as of 18:47, 2 September 2013

In quantum mechanics, and especially quantum information theory, the linear entropy or impurity of a state is a scalar defined as

where ρ is the density matrix of the state.

The linear entropy can range between zero, corresponding to a completely pure state, and (1 − 1/d), corresponding to a completely mixed state. (Here, d is the dimension of the density matrix.)

The linear entropy is trivially related to the purity of a state by

Motivation

The linear entropy is a lower approximation to the (quantum) von Neumann entropy S, which is defined as

The linear entropy then is obtained by expanding ln ρ = ln (1−(1−ρ)), around a pure state, ρ2=ρ; that is, expanding in terms of the non-negative matrix 1−ρ in the formal Mercator series for the logarithm,

and retaining just the leading term.

The linear entropy and von Neumann entropy are similar measures of the degree of mixing of a state, although the linear entropy is easier to calculate, as it does not require diagonalization of the density matrix.

Alternate definition

Some authors[1] define linear entropy with a different normalization

which ensures that the quantity ranges from zero to unity.

References

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