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NumberNumber

NumberNumber(integer i, integer j) -> OperatorFermiNamed​

Returns the two-site fermionic number-number interaction operator ninj=fi†fifj†fjn_{i} n_{j} = f_{i}^\dagger f_{i} f_{j}^\dagger f_{j} with support on the specified sites.

Parameters​

  • i: The first site index.
  • j: The second site index.

Example​

NumberNumber(1,2)*Fbit("0110") // Returns (1 + 0i)|0110>