Equation 7 · Part 1 · The Entry a Relabeling Cannot Write
Symbol Lambda
What this part means
the trace-preserving map.
Its job in the formula
Lambda is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol Lambda→Article meaning
Where the article explains it
It is built from a completely positive, trace-preserving map , a quantum channel sending fine states to coarse states, together with a coarse Hilbert space and a Hermitian coarse Hamiltonian on it.
The passage around this formula
A coarse description reports less. It is built from a completely positive, trace-preserving map , a quantum channel sending fine states to coarse states, together with a coarse Hilbert space and a Hermitian coarse Hamiltonian on it. The simplest case is the partial trace over the bath, = [] with = ; nothing below depends on that particular choice, and a passive relabeling built from no discarding at all, treated next, is a channel too.
Learn the underlying idea
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Sources cited in the article section
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