Beginner's Guide to Quantum: Quantum 101
A quantum gate is a reversible (unitary) operation applied to one or more qubits. Thus quantum gates change the state of the quantum qubit.
The various types of gates that are available in Qiskit include:
- Classical Gates: NOT, CNOT, Toffoli (CCX), SWAP, Identity (I)
- Phase Gates: T, S, Z, T†, S†, RZ,
- Hadamard Gate: H
- Quantum Gates: √X, √X†, Y, RX, RY, RXX, RZZ, U,
- Non-unitary Operators and Modifiers: Reset, Measurement, Control, If, Barrier,
This system relies on building really reliable qubits where basic quantum circuit operations, or gates, can be put together to create any sequence, running more and more complex algorithms.
References:
- Beginner's Guide to Quantum | Quantum 101:
https://youtu.be/C74R5ZYjOFs?t=313 - Quantum Gate:
https://quantum-computing.ibm.com/composer/docs/iqx/terms-glossary#term-quantum-gate - Lecture 2 Notes:
https://csferrie.medium.com/introduction-to-quantum-computing-49b31b96e70f - Playlist: Lectures and Labs for Introduction to Quantum Computing:
https://www.youtube.com/playlist?list=PLtvBHm6EzL47oFXGRB7Oe-kfcn_0ZnJE2 - Qiskit:
https://qiskit.org