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Springer eBooks

Probability Distributions as Alternatives of the Density Operator and Wave Function for Describing Quantum States

Margarita A. Man’ko, Vladimir I. Man’ko

Published Jan 1, 2023• 1 citation
Publisher
DOI
10.1007/978-3-031-12986-5_10

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The general problem of describing quantum states not only by wave functions and density operators but also by probability distribution functions is discussed in this paper. The qubit-state density-matrix elements expressed in terms of probability distributions are connected with the irreducible representation of group SU(2). The transform of the probability distributions corresponding to the unitary transform of the qubit state of the spin-1/2 system is obtained and expressed in terms of matrix elements of the group SU(2). The possibility to extend the introduced formalism to other quantum states is suggested. For qubit systems, the notion of density operators algebra and the relation with the probability representation of quantum states are discussed. The Schrödinger equation for qubit states is obtained as an equation for probabilities.
The quantizer–dequantizer method is employed. Using the construction of probability distributions describing density operators of a quantum system states, the connection between the Feynman path integral and the time evolution of the density operator (Landau density matrix) as well as the wave function of the stateconsidered. For single–mode systems with continuous variables, a tomographic propagator is introduced in the probability representation of quantum mechanics. An explicit expression for the probability in terms of the Green function of the Schrödinger equation is obtained. Equations for the Green functions defined by arbitrary integrals of motion are derived. Examples of probability distributions describing the evolution of state of a free particle, as well as states of systems with integrals of motion that depend on time (oscillator type) are discussed.
In this paper authors discuss the inverse problem for the density operator describing a bi-modal quantum mixed states of polarized optical field with the reduced probability density function. It is reduced because we assume that photons phase is known - it is represented by the Dirac delta function in the probability distribution. We ask for example if it is possible to represent an elliptically polarized plane wave in the basis of linearly polarized photons (or photons with any other arbitrary chosen phase). Our goal is to define a reversible integral transformation in order to represent the reduced probability density function by the density operator describing a mixed state and to analyze the uniqueness of the solution. This problem is similar to calculating Glauber-Sudarshan function when representing a quantum mixed state in the coherent states basis. However the integral transformation that we search is not that easy to define. It is based on convolution and cross-correlation operations. The operator that generates this transformation is defined using the Stokes operators.