QuantumSim

QuantumSim is a simulator for quantum circuits.

Setting up

Clone the repository

git clone https://github.com/rbudhrani/QuantumSim

Run the tests from the root folder

cd<path-to-repository>/QuantumSim && make check

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Usage

The QubitLayer class in src/QubitLayer.cpp defines the functions for the quantum gates and the arrays that store the amplitudes for the qubits. The table below lists the functions that can be used by a QubitLayer object. precision is a typedef for double. The supported gates are:

Quantum Gate	Function
Pauli X	applyPauliX(int target)
Pauli Y	applyPauliY(int target)
Pauli Z	applyPauliZ(int target)
Hadamard	applyHadamard(int target)
Rotation X	applyRx(int target, precision theta)
Rotation Y	applyRy(int target, precision theta)
Rotation Z	applyRz(int target, precision theta)
Controlled NOT	applyCnot(int control, int target)
Toffoli	applyToffoli(int control1, int control2, int target)
Multiple controlled CNOT	applyMcnot(int *controls, int numControls, int target)
Controlled Z	applyCz(int control, int target)
Multiple controlled Z	applyMcz(int *controls, int numControls, int target)

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Example

Running a quantum circuit is done by writing the circuit in src/main.cpp.

#include<iostream>
#include<complex>
#include"QubitLayer.hpp"
#include"qAlgorithms.hpp"intmain(){
// create a QubitLayer object
QubitLayer q;
// apply a hadamard gate
q.applyHadamard(0);
// apply cnot on the 2 qubits
q.applyCnot(0, 1);
// print qubits
q.printQubits();
}

This circuit creates an EPR pair.

By default when a QubitLayer object is created, it is initialised with 2 qubits. To setup a larger quantum circuit, a QubitLayer object can be constructed using arguments.

#include<iostream>
#include<complex>
#include"QubitLayer.hpp"
#include"qAlgorithms.hpp"intmain(){
// create a QubitLayer object with 4 qubits
QubitLayer q(4);
// apply hadamard gates
q.applyHadamard(0);
q.applyHadamard(2);
// apply cnot gates
q.applyCnot(0, 1);
q.applyCnot(2, 3);
// print qubits
q.printQubits();
}

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Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.