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https://github.com/adamisntdead/qusimpy

A Multi-Qubit Ideal Quantum Computer Simulator
https://github.com/adamisntdead/qusimpy

quantum-computing quantum-simulator

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A Multi-Qubit Ideal Quantum Computer Simulator

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README 

        
# QuSim.py



[![Build Status](https://travis-ci.org/adamisntdead/QuSimPy.svg?branch=master)](https://travis-ci.org/adamisntdead/QuSimPy)



Qusim.py is a toy multi-qubit quantum computer simulator, written in 150 lines of python



This code makes it easy for you to see how a quantum computer computes by

following the linear algebra!



```python

from QuSim import QuantumRegister



#############################################

#                 Introduction              #

#############################################

# Here Will Be A Few Example of Different

# Quantum States / Algorithms, So You Can

# Get A Feel For How The Module Works, and  

# Some Algorithmic Ideas



#############################################

#            Quantum Measurement            #

#############################################

# This experiment will prepare 2 states, of a

# Single qubit, and of 5 qubits, and will just

# Measure them



OneQubit = QuantumRegister(1)  # New Quantum Register of 1 Qubit

print('One Qubit: ' + OneQubit.measure())  # Should Print 'One Qubit: 0'



FiveQubits = QuantumRegister(5)  # New Quantum Register of 5 Qubits

# Should Print 'Five Qubits: 00000'

print('Five Qubits: ' + FiveQubits.measure())



#############################################

#                 Swap 2 Qubits             #

#############################################

# Here, We Will Apply a Pauli-X Gate / NOT Gate

# To the first qubit, and then after the algorithm,

# it will be swapped to the second qubit.



Swap = QuantumRegister(2)  # New Quantum Register of 2 qubits

Swap.applyGate('X', 1)  # Apply The NOT Gate. If Measured Now, it should be 10



# Start the swap algorithm

Swap.applyGate('CNOT', 1, 2)

Swap.applyGate('H', 1)

Swap.applyGate('H', 2)

Swap.applyGate('CNOT', 1, 2)

Swap.applyGate('H', 1)

Swap.applyGate('H', 2)

Swap.applyGate('CNOT', 1, 2)

# End the swap algorithm



print('SWAP: |' + Swap.measure() + '>')  # Measure the State, Should be 01



#############################################

#               Fair Coin Flip              #

#############################################

# Shown in this 'Experiment', is a so called 'Fair Coin Flip',

# Where a state will be prepared, that has an equal chance of

# Flipping to Each Possible State. to do this, the Hadamard

# Gate will be used.



# New Quantum Register of 1 Qubit (As a coin has only 2 states)

FairCoinFlip = QuantumRegister(1)

# If measured at this point, it should be |0>



# Apply the hadamard gate, now theres an even chance of measuring 0 or 1

FairCoinFlip.applyGate('H', 1)



# Now, the state will be measured, flipping the state to

# either 0 or 1. If its 0, we will say "Heads", or if its

# 1, we will say "Tails"

FairCoinFlipAnswer = FairCoinFlip.measure()  # Now its flipped, so we can test

if FairCoinFlipAnswer == '0':

    print('FairCoinFlip: Heads')

elif FairCoinFlipAnswer == '1':

    print('FairCoinFlip: Tails')



#############################################

#             CNOT Gate                     #

#############################################

# In this experiment, 4 states will be prepared, {00, 01, 10, 11}

# And then the same CNOT Gate will be run on them,

# To Show The Effects of the CNOT. The Target Qubit will be 2, and the control 1



# New Quantum Register of 2 Qubits, done 4 times.

# If any are measured at this time, the result will be 00

ZeroZero = QuantumRegister(2)

ZeroOne = QuantumRegister(2)

OneZero = QuantumRegister(2)

OneOne = QuantumRegister(2)



# Now prepare Each Into The State Based On Their Name

# ZeroZero Will be left, as thats the first state anyway

ZeroOne.applyGate('X', 2)

OneZero.applyGate('X', 1)

OneOne.applyGate('X', 1)

OneOne.applyGate('X', 2)



# Now, a CNOT Will Be Applied To Each.

ZeroZero.applyGate('CNOT', 1, 2)

ZeroOne.applyGate('CNOT', 1, 2)

OneZero.applyGate('CNOT', 1, 2)

OneOne.applyGate('CNOT', 1, 2)



# Print the results.

print('CNOT on 00: |' + ZeroZero.measure() + '>')

print('CNOT on 01: |' + ZeroOne.measure() + '>')

print('CNOT on 10: |' + OneZero.measure() + '>')

print('CNOT on 11: |' + OneOne.measure() + '>')

```



Largely based on the code from [corbett/QuantumComputing](https://github.com/corbett/QuantumComputing).



If you are interested in a efficient, high performance, hardware accelerated

quantum computer simulator written in Rust, please check out [QCGPU](https://github.com/qcgpu/qcgpu-rust)