supergrad.utils.operators module

The code is from qutip.operators. This module contains functions for generating a variety of commonly occurring quantum operators.

List of Operators

jmat(j, *args)	Higher-order spin operators:
spin_Jx(j)	Spin-j x operator
spin_Jy(j)	Spin-j y operator
spin_Jz(j)	Spin-j z operator
spin_Jm(j)	Spin-j annihilation operator
spin_Jp(j)	Spin-j creation operator
spin_J_set(j)	Set of spin-j operators (x, y, z)
sigmap()	Creation operator for Pauli spins.
sigmam()	Annihilation operator for Pauli spins.
sigmax()	Pauli spin 1/2 sigma-x operator
sigmay()	Pauli spin 1/2 sigma-y operator.
sigmaz()	Pauli spin 1/2 sigma-z operator.
destroy(n[, offset])	Destruction (lowering) operator.
create(n[, offset])	Creation (raising) operator.
qeye(dimensions)	Identity operator.
identity(dims)	Identity operator.
position(n[, offset])	Position operator \(x = 1 / sqrt(2) * (a + a.dag())\)
momentum(n[, offset])	Momentum operator p=-1j/sqrt(2)*(a-a.dag())
num(n[, offset])	Quantum object for number operator.
squeeze(n, z[, offset])	Single-mode squeezing operator.
squeezing(a1, a2, z)	Generalized squeezing operator.
displace(n, alpha[, offset])	Single-mode displacement operator.
commutator(A, B[, kind])	Return the commutator of kind kind (normal, anti) of the
qutrit_ops()	Operators for a three level system (qutrit).
qdiags(diagonals, offsets)	Constructs an operator from an array of diagonals.
phase(n[, phi0])	Single-mode Pegg-Barnett phase operator.
qzero(dimensions)	Zero operator.
charge(nmax[, nmin, frac])	Generate the diagonal charge operator over charge states
tunneling(n[, m])	Tunneling operator with elements of the form