5 research outputs found
Tomography on f-oscillators
Symplectic tomographies of classical and quantum states are shortly reviewed.
The concept of nonlinear f-oscillators and their properties are recalled. The
tomographic probability representations of oscillator coherent states and the
problem of entanglement are then discussed. The entanglement of even and odd
f-coherent states is evaluated by the linear entropy
Characterization of the nonlinear qubit map using the probability parametrization
Considering a qubit density matrix in probability parametrization we demonstrated that the nonlinear transform of the matrix provides the state with the density either chaotic one or practically pure one. An example of a qubit is studied in detail
The replica method and entropy for a mixture of two-mode even and odd Schrödinger cat states
We review the replica method for calculating the von Neumann entropy and obtain an explicit expression for the entropy of the mixed coherent states |αă and |ÎČă employing this method. We study the purity inequality for a bipartite system for separable states on the example of even and odd Schrödinger cat state