YaoExtensions

Extensions for Yao.

List of features

Easy constructions

• circuits

  • variational_circuit(n): construct a random parametrized circuit.
  • rand_supremacy2d(nx, ny, depth): construct a quantum supremacy circuit.
  • qft_circuit(n): construct a quantum fourier transformation circuit.
  • rand_google53(): construct a Google's 53 qubit supremacy circuit.

• circuit building blocks

  • general_U4(): an optimal decomposition of a U(4) gate.
  • cphase(nbit, i, j), cz(nbit, i, j)

• hamiltonians

  • heisenberg(n): construct a heisenberg hamiltonian.
  • transverse_ising(n): construct a transverse field Ising hamiltonian.

Block extensions

• primitive blocks

  • SqrtX, SqrtY, FSim, ISWAP, SqrtW
  • Mod: modulo operation block.
  • QFT: faster implementation of QFT subroutine, instead of running QFT circuit faithfully, simulate it with classical fft (thus much faster).
  • RotBasis: basis rotor, make measurements on different basis easier.
  • MathGate: classical mathematic functions.
  • ReflectGate: used in grover search,

• composite blocks

  • Bag: a trivial container block that gives the flexibility to change the sub-block, as well as masking. Mainly used for structure learning.
  • ConditionBlock: conditional control the excusion of two block.
  • Sequence: similar to chain block, but more general, one can put anything inside.
  • PauliString: a paulistring.

Utlities

• gatecount, count the number of gates,
• faithful simulation of gradients, including observable loss and MMD loss