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Symbol of RealMPO.

(const RealMPO lhs [] integer index) -> RealTensor​

Access a specific site tensor in the MPO chain by index. Supports negative indexing (e.g., -1 for the last site).

Parameters​

  • lhs: Left-hand side value.
  • index: Site index (0-based, supports negative indexing).

Returns​

The 4-dimensional tensor at the specified site with indices [left_bond, physical_out, physical_in, right_bond].