Changes.

Author: amitjamadagni

src/arrays/ladderops.jl

@@ -37,45 +37,7 @@ function momentumop(n::Int)
     return scale(im/sqrt(2.), cop-cop')
 end
 
-function spin_h1(j::Float64)
-    if (isinteger(2*j) && j>0)
-        m = reverse([-j:j-1])
-        N = length(m)+1
-        m_coeffs = [sqrt(j*(j+1.0) - (x+1.0)*x) for x in m]
-        return spdiagm(m_coeffs,1,N,N)
-    else
-        return error("j must be non-negative integer or half integer")
-  end
-end
-
-function spin_h2(j::Float64)
-    if (isinteger(2*j) && j>0)
-        m = reverse([-j:j])
-        N = length(m)
-        return spdiagm(m,0,N,N)
-    else
-        return error("j must be non-negative integer or half integer")
-  end
-end
-
-spin_jx(j::Float64) = QuArray(0.5*(spin_h1(j)+spin_h1(j)'))
-spin_jy(j::Float64) = QuArray(-0.5*im*(spin_h1(j)-spin_h1(j)'))
-spin_jz(j::Float64) = QuArray(spin_h2(j))
-spin_jp(j::Float64) = QuArray(spin_h1(j))
-spin_jm(j::Float64) = QuArray(spin_h1(j)')
-sigmax = 2.0 * spin_jx(0.5)
-sigmay = 2.0 * spin_jy(0.5)
-sigmaz = 2.0 * spin_jz(0.5)
-
 export raiseop,
     lowerop,
     positionop,
-    momentumop,
-    spin_jx,
-    spin_jy,
-    spin_jz,
-    spin_jp,
-    spin_jm,
-    sigmax,
-    sigmay,
-    sigmaz
+    momentumop