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======= blueqat

A quantum computing SDK

Version

.. image:: https://badge.fury.io/py/blueqat.svg :target: https://badge.fury.io/py/blueqat

Build info

.. image:: https://circleci.com/gh/Blueqat/Blueqat.svg?style=svg :target: https://circleci.com/gh/Blueqat/Blueqat

Tutorial

https://github.com/Blueqat/Blueqat-tutorials

Install

.. code-block:: sh

git clone https://github.com/Blueqat/Blueqat
cd Blueqat
pip3 install -e .

or

.. code-block:: sh

pip3 install blueqat

Circuit

.. code-block:: python

from blueqat import Circuit
import math

#number of qubit is not specified
c = Circuit()

#if you want to specified the number of qubit
c = Circuit(3) #3qubits

Method Chain

.. code-block:: python

# write as chain
Circuit().h[0].x[0].z[0]

# write in separately
c = Circuit().h[0]
c.x[0].z[0]

Slice

.. code-block:: python

Circuit().z[1:3] # Zgate on 1,2
Circuit().x[:3] # Xgate on (0, 1, 2)
Circuit().h[:] # Hgate on all qubits
Circuit().x[1, 2] # 1qubit gate with comma

Rotation Gate

.. code-block:: python

Circuit().rz(math.pi / 4)[0]

Measurement

.. code-block:: python

Circuit().m[0]

Run()

.. code-block:: python

Circuit().h[0].cx[0,1].run()

Run(shots=n)

.. code-block:: python

c = Circuit().h[0].cx[0,1].m[:]
c.run(shots=100) # => Counter({'00': 48, '11': 52}) (random value.)

Hamiltonian

.. code-block:: python

from blueqat.pauli import *

hamiltonian1 = (1.23 * Z[0] + 4.56 * X[1] * Z[2]) ** 2
hamiltonian2 = (2.46 * Y[0] + 5.55 * Z[1] * X[2] * X[1]) ** 2
hamiltonian = hamiltonian1 + hamiltonian2
print(hamiltonian)

simplify the hamiltonian

.. code-block:: python

hamiltonian = hamiltonian.simplify()
print(hamiltonian)

VQE

.. code-block:: python

from blueqat import vqe
from blueqat.pauli import qubo_bit as q

hamiltonian = -3*q(0)-3*q(1)-3*q(2)-3*q(3)-3*q(4)+2*q(0)*q(1)+2*q(0)*q(2)+2*q(0)*q(3)+2*q(0)*q(4)+2*q(1)*q(2)+2*q(1)*q(3)+2*q(1)*q(4)+2*q(2)*q(3)+2*q(2)*q(4)+2*q(3)*q(4)
step = 2

result = vqe.Vqe(vqe.QaoaAnsatz(hamiltonian, step)).run()
print(result.most_common(12))

If you want to create an ising model hamiltonian use Z(x) instead of q(x) in the equation

.. code-block:: python

hamiltonian = Z(0)-3*Z(1)+2*Z(0)*Z(1)+2*Z(0)*Z(2)

Blueqat to Qiskit

.. code-block:: python

qiskit.register(APItoken)
sampler = blueqat.vqe.get_qiskit_sampler(backend="backend name")
result = blueqat.vqe.Vqe(QaoaAnsatz(...), sampler=sampler).run(verbose=True)

Blueqat to QASM

.. code-block:: python

Circuit.to_qasm()

#OPENQASM 2.0;
#include "qelib1.inc";
#qreg q[1];
#creg c[1];
#h q[0];

Example

2-qubit Grover

.. code-block:: python

from blueqat import Circuit
c = Circuit().h[:2].cz[0,1].h[:].x[:].cz[0,1].x[:].h[:].m[:]
print(c.run(shots=1))

Maxcut QAOA

.. code-block:: python

from blueqat import vqe, pauli
edges = [(0, 1), (1, 2), (2, 3), (3, 0), (1, 3), (0, 2), (4, 0), (4, 3)]
ansatz = vqe.QaoaAnsatz(sum([pauli.Z(i) * pauli.Z(j) for i, j in edges]), 1)
result = vqe.Vqe(ansatz).run()
print(
"""   {4}
  / \\
 {0}---{3}
 | x |
 {1}---{2}""".format(*result.most_common()[0][0]))

Document

https://blueqat.readthedocs.io/en/latest/

Author

Takumi Kato (blueqat), Yuichiro Minato (blueqat), Yuma Murata (D Slit Technologies), Satoshi Takezawa (TerraSky)

Disclaimer

Copyright 2020 The Blueqat Developers.