For an ensemble of two-level qubits, these quantities are given by the trace of the product of the density matrix with the identity and Pauli matrices.
For an ensemble of two-level qubits, these quantities are given by the trace of the product of the density matrix with the identity and Pauli matrices. Three of these values are equal to the difference in the expectation value of the square of the two E-field components in either a Cartesian, rotated Cartesian, or circular basis. The effect of an element upon the set of these values can be determined by multiplying by a (*) Mueller matrix, and three of them define the axes of the PoincarÃ© sphere. These quantities do not retain information about the phase, meaning they cannot be used on coherent sources, for which Jones matrix calculus is used instead. For 10 points, name these four numbers denoted I, Q, U and V, which describe the polarization of light.
For an ensemble of two-level qubits, these quantities are given by the trace of the product of the density matrix with the identity and Pauli matrices.
Stokes parameters