2013

Quantum Commuting Circuits and Complexity of Ising Partition Functions

Fujii, Keisuke, Morimae, Tomoyuki

Understand

Instantaneous quantum polynomial-time (IQP) computation is a class of quantum computation consisting only of commuting two-qubit gates and is not universal in the sense of standard quantum computation.

  • Nevertheless, it has been shown that if there is a classical algorithm that can simulate IQP efficiently, the polynomial hierarchy (PH) collapses at the third level, which is highly implausible.
  • However, the origin of the classical intractability is still less understood.
  • Here we establish a relationship between IQP and computational complexity of the partition functions of Ising models.

Reading the bibliography…