Reset is an important operation in Quantum Computing that allows to reset the state of a Qubit. In this chapter of the OpenQASM Tutorial, you will be learning about how to reset the state of a Qubit.
The reset operation destroys the state of the Qubit. Therefore, the reset operation generally follows the measurement operation on a Qubit. The Reset operation resets the state of a Qubit to |0>.
OpenQASM provides the optionality to reset the state of a single Qubit in the Quantum Register, or all the Qubits in the Quantum Register at once.
Reset a Qubit
The state of a single Qubit in the Quantum Register can be reset to |0> by using the reset keyword. The following syntax is used to reset the state of a Qubit at given index of the Quantum Register-
reset quantum_register[index];Example
Below is an example of resetting the state of first Qubit of Quantum Register qubits.
reset qubits[0];Reset a Quantum Register
It is also possible to reset the state of all the Qubits of a Quantum Register to |0> at once by using the reset keyword. The following syntax is used to reset the state of all the Qubits of a Quantum Register at once-
reset quantum_register;Example
Below is an example of resetting the state of all Qubits of Quantum Register qubits.
reset qubits;Note– Notice that both reset instructions make use of the reset keyword in different ways.