QProg

Quantum programming is used for writing and constructing quantum programs, generally understood as a sequence of operations. Due to the fact that classical computing is also included in quantum algorithms, the industry envisions that the quantum computers that will emerge in the near future will be hybrid structures, consisting of two main parts, one of which is a classical computer responsible for performing classical computing and control; The other part is quantum devices, responsible for performing quantum computing. QPanda3 regards the programming process of quantum programs as a part of classical program execution, and the entire peripheral host program must include the part that creates quantum programs.

Constructors

You can create a QProg instance using several constructors:

Default Constructor
Python

prog = QProg()
Constructor with Qubits Number
Python

prog = QProg(qubits_num)
Copy Constructor
Python

prog_copy = QProg(prog)
Constructor with a Circuit
Python

circuit = QCircuit()

prog = QProg(circuit)

Member Functions

The following functions can be used to manipulate and query the QProg instance:

Append Operations

You can append gates, circuits, or measurements:

Python

prog.append(H(0))

prog.append(QCircuit())

prog.append(measure(0,0))
Operator Overloading

You can use the << operator to append nodes:

Python

prog << H(0) << QCircuit() << measure(0,0)
Querying Properties

Using the qubits_num and cbits_num function to get the number of qubits and classical bits:

Python

num_qubits = prog.qubits_num()

num_cbits = prog.cbits_num()
Get Qubits and Classical Bits

Using the qubits and cbits function to retrieve the lists of qubits and classical bits:

Python

qubits = prog.qubits()

cbits = prog.cbits()
Operations

Using the operations function to retrieve the operations:

Python

operations = prog.operations()
Gate Operations

Using the gate_operations function to get the list of gate operations,The meaning of the parameter is to only obtain two qubit gates:

Python

gates = prog.gate_operations(only_q2=False)
Count Operations

Using the count_ops function to count the operations in the program,The meaning of the parameter is to only count two qubit gates:

Python

count = prog.count_ops(only_q2=False)
Depth of the Program

Using the depth function to get the depth of the program,The meaning of the parameter is to only count two qubit gates:

Python

depth = prog.depth(only_q2=False)
Flatten and Convert to Circuit

Using the flatten and to_circuit function to flatten the program or convert it to a circuit:

Python

flat_prog = prog.flatten()

circuit = prog.to_circuit()
Clearing the Program

Using the clear function to clear all operations from the program:

Python

prog.clear()

Example Usage

Here’s a simple example of how to create a quantum program, run quantum program and measure results:

Run result:

Table of Contents

QProg

Constructors

Member Functions

Example Usage