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Forest backend for Qiskit

Allows running Qiskit code on Rigetti simulators and quantum computers by changing only two lines of your Qiskit code.

More goodies at https://quantastica.com

Install

pip install quantastica-qiskit-forest

Usage

Import ForestBackend into your Qiskit code:

from quantastica.qiskit_forest import ForestBackend

And replace Aer.get_backend with ForestBackend.get_backend.

Example

from qiskit import QuantumRegister, ClassicalRegister
from qiskit import QuantumCircuit, execute, Aer

# Import ForestBackend:
from quantastica.qiskit_forest import ForestBackend

qc = QuantumCircuit()

q = QuantumRegister(2, "q")
c = ClassicalRegister(2, "c")

qc.add_register(q)
qc.add_register(c)

qc.h(q[0])
qc.cx(q[0], q[1])

qc.measure(q[0], c[0])
qc.measure(q[1], c[1])


# Instead:
#backend = Aer.get_backend("qasm_simulator")

# Use:
backend = ForestBackend.get_backend("qasm_simulator")

# OR:
# backend = ForestBackend.get_backend("statevector_simulator")
# backend = ForestBackend.get_backend("Aspen-7-28Q-A")
# backend = ForestBackend.get_backend("Aspen-7-28Q-A", as_qvm=True)
# ...

# To speed things up a little bit qiskit's optimization can be disabled
# by setting optimization_level to 0 like following:
# job = execute(qc, backend=backend, optimization_level=0)
job = execute(qc, backend=backend)
job_result = job.result()

print(job_result.get_counts(qc))

Prerequisites

Running on your local Rigetti simulator

You need to install Rigetti Forest SDK and make sure that quilc compiler and qvm simulator are running:

Open new terminal and run:

quilc -S

And in one more new terminal run:

qvm -S -c

Running on Rigetti quantum computer

  • You need to get access to Rigetti Quantum Cloud Services (QCS)

  • In your Quantum Machine Image (QMI) install this package and Qiskit

  • Reserve a QPU lattice

  • Run your code via QMI terminal or Jupyter notebook served by your QMI

Details

Syntax

ForestBackend.get_backend(backend_name = None, as_qvm = False)

Arguments

backend_name can be:

  • any valid Rigetti lattice name

OR:

  • qasm_simulator will be sent to QVM as Nq-qvm (where N is number of qubits in the circuit)

  • statevector_simulator will be executed as WavefunctionSimulator.wavefunction()

If backend name is not provided then it will act as qasm_simulator

as_qvm boolean:

  • False (default)

  • True: if backend_name is QPU lattice name, then code will execute on QVM which will mimic QPU

That's it. Enjoy! :)