Quil (instruction set architecture)

Quil is a quantum instruction set architecture that first introduced a shared quantum/classical memory model. It was introduced by Robert Smith, Michael Curtis, and William Zeng in A Practical Quantum Instruction Set Architecture.^[1] Many quantum algorithms (including quantum teleportation, quantum error correction, simulation,^[2][3] and optimization algorithms^[4]) require a shared memory architecture. Quil is being developed for the superconducting quantum processors developed by Rigetti Computing through the Forest quantum programming API.^[5][6] A Python library called pyQuil was introduced to develop Quil programs with higher level constructs. A Quil backend is also supported by other quantum programming environments.^[7][8]

Example

The following example demonstrates the classical control flow needed to do quantum teleportation of the qubit in register 0 to register 2:

# Create Bell Pair
H 0
CNOT 0 1
# Teleport
CNOT 2 0
H 2
MEASURE 2 [0]
MEASURE 0 [1]
# Classically communicate measurements
JUMP-UNLESS @SKIP [1]
X 1
LABEL @SKIP
JUMP-UNLESS @END [0]
Z 1
LABEL @END

References