Representation of superoperators in double phase space

Marcos Saraceno, Alfredo Miguel Ozorio de Almeida

Resumo


Operators in quantum mechanics - either observables, density or evolution operators, unitary or not - can be represented by c-numbers in operator bases. The position and momentum bases are in one to one correspondence with lagrangian planes in double phase space, but this is also true for the well known Wigner-Weyl correspondence based on translation and reflection operators. These phase space methods are here extended to the representation of superoperators. We show

that the Choi-Jamiolkowsky isomorphism between the dynamical matrix and the linear action of the superoperator

constitutes a "double" Wigner or chord transform when represented in double phase space. As a byproduct several previously unknown

integral relationships between products of Wigner and chord distributions for pure states are derived. 

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