atlas_q.mpo_ops.correlation_function

atlas_q.mpo_ops.correlation_function(op1, site1, op2, site2, mps)

Compute two-point correlation function: ⟨ψ| O₁(site1) O₂(site2) |ψ⟩

Args:

op1: First operator (2×2) site1: First site op2: Second operator (2×2) site2: Second site mps: MPS state

Returns:

Correlation ⟨O₁ O₂⟩