Define the projection operators using ITensors function ITensors.op!(Op::ITensor, ::OpName"Pup", ::SiteType"S=1/2", s::Index) Op[s'=>1,s=>1] = 1.0 end function ITensors.op!(Op::ITensor, ::OpName"Pdn", …

Hi, so I found the problem. The norm of the state you are computing expected values within is zero. This is because the spin you act Pdn on is exactly in the up state, so projecting it to be down makes the state go to zero (even though the individual MPS tensors might have non-zero parameters in som…

Applying down projection operator to Up spin site gives psi with "Sz" = NaN instead of 0.

ITensor Julia Questions

mtfishman November 14, 2023, 2:45pm 2

Could you format your code? See Please Read: Make It Easier to Help You.

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Applying down projection operator to Up spin site gives psi with "Sz" = NaN instead of 0.

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