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Paper   IPM / P / 17176
School of Physics
  Title:   A universal approach to Krylov State and Operator complexities
1.  M. Alishahiha
2.  S. Banerjee
  Status:   Published
  Journal: SciPost Phys.
  Vol.:  15
  Year:  2023
  Pages:   080
  Supported by:  IPM
We present a general framework in which both Krylov state and operator complexities can be put on the same footing. In our formalism, the Krylov complexity is defined in terms of the density matrix of the associated state which, for the operator complexity, lives on a doubled Hilbert space obtained through the channel-state map. This unified definition of complexity in terms of the density matrices enables us to extend the notion of Krylov complexity, to subregion or mixed state complexities and also naturally to the Krylov mutual complexity. We show that this framework also encompasses nicely the holographic notions of complexity.

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