To start working with the Quantum Computing Library Toolkit, first copy the 'QCLibs' folder to the project folder and then just type the following line in your C/C++ program:-

#include "QCLibs/QCLibs.h"

This should include all the functionalities for defining Qubits and doing various Operations on them!

Also see the 'Examples' folder to know more about the functionality. The 'Examples' folder contains various examples like:-

1. CNOT Gate
2. Hadamard Gate
3. Rotation of qubits about X, Y, Z - Axes of Bloch Sphere
4. Quantum NOT Gate
5. Quantum Registers
6. Quantum Rotation about imaginary axis
7. Quantum swapping of two Qubits

This feature allows the use to make registers consisting of multiple qubits at a time.

To make the coding of these gates easier, a functionality of short-hand gates is provided. The gates can be applied to the register as follows:-

quReg *qr = newQuReg(2);

char gate_string[] = "(T: quReg2 = ), \
						(Pa), \
						{\
							[X, X], [Z, Y], [H, H], [X, Z], [Y, X] \
						},\
						(Pnz)";

qr = applyGates_reg(gate_string, qr);

OUTPUT:

./q.out

quReg2 = 
[0]:	{1.000000 + 0.000000 i} |00>	100.00 %
[1]:	{0.000000 + 0.000000 i} |01>	0.00 %
[2]:	{0.000000 + 0.000000 i} |10>	0.00 %
[3]:	{0.000000 + 0.000000 i} |11>	0.00 %

quReg2 = 
[0]:	{-0.000000 - 0.500000 i} |00>	25.00 %
[1]:	{-0.000000 + 0.500000 i} |01>	25.00 %
[2]:	{-0.000000 - 0.500000 i} |10>	25.00 %
[3]:	{-0.000000 + 0.500000 i} |11>	25.00 %

The above code segment has the following meaning:-

• Initialize a new quRegister.
• Display text for the quRegister is "quReg2 = ".
• (Pa) -> Print all possible combinations of 'n' qubits in the quRegister.
• Pauli gate 'X' is applied to [qubit[0], qubit[1]] respectively.
• Pauli gate 'Z' is applied to qubit[0] and 'Y' to qubit[1] respectively, and so on.
• (Pnz) -> Print only non-zero magnitude values.

• Pauli-X gate: X
• Pauli-Y gate: Y
• Pauli-Z gate: Z
• Hadamard gate: H
• Phase gate: S
• Rotation gate: R_xx.xx (x = 0, 1,..., 9; AngleMode = degrees)
• CNOT gate: (atleast one 'Co' and one 'Cx' should be there in same [.])
  • Control gate: Co
  • NOT gate: Cx
• Swap gate: Sx (atleast two should be there in same [.])
• Quantum Fourier Transform (QFT): Q (coming soon...)
• Inverse QFT: Qi (coming soon...)

For more info, see the examples: https://github.com/AbeerVaishnav13/Quantum-Computing-Library/tree/master/Examples

*Currently, the library supports registers upto 28-qubits with 8GB of memory.

and more on the way!

Enjoy! :)

Regards Abeer Vaishnav