Pure and Mixed States

Autor(es)

Barata, J. C. A. ^[1] ; Brum, M. ^[2] ; Chabu, V. ^[1] ; Correa da Silva, R. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Fis, CP 66-318, BR-05314970 Sao Paulo, SP - Brazil

^[2] Univ Fed Rio de Janeiro, Campus UFRJ Duque de Caxias, BR-25240005 Duque De Caxias, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Journal of Physics; v. 51, n. 2, SI, p. 244-262, APR 2021.
• Citações Web of Science: 1

Resumo

We present a review on the notion of pure states and mixtures as mathematical concepts that apply for both classical and quantum physical theories, as well as for any other theory depending on statistical description. Here, states will be presented as expectation values on suitable algebras of observables, in a manner intended for the non-specialist reader; accordingly, basic literature on the subject will be provided. Examples will be exposed together with a discussion on their meanings and implications. An example will be shown where a pure quantum state converges to a classical mixture of particles as Planck's constant tends to 0. (AU)

• Processo FAPESP: 17/13865-0 - Estudo semiclássico de cruzamentos de autovalores com aplicações à Física.
• Beneficiário: Victor Bernardo Chabu
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/02975-4 - Aspectos matemáticos de teorias quânticas de campos em espaços-tempos curvos
• Beneficiário: Marcos Carvalho Brum de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado