About Quantum coherence:
- It deals with the idea that all objects have wave-like properties.
- It states that, if an object's wave-like nature is split in two, then the two waves may coherently interfere with each other in such a way as to form a single state that is a superposition of the two states.
- This concept of superposition is famously represented by Schrödinger's cat, which is both dead and alive at the same time when in its coherent state inside a closed box.
- It lies at the heart of quantum computing, in which a qubit is in a superposition of the "0" and "1" states.
What is Quantum entanglement?
- It means that aspects of one particle of an entangled pair depend on aspects of the other particle, no matter how far apart they are or what lies between them.
- Like coherence, quantum entanglement also plays an essential role in quantum technologies.
What is the principle of Superposition of waves?
- It states that when two or more waves overlap in space, the resultant disturbance is equal to the algebraic sum of the individual disturbances.
What is a qubit?
- A qubit (or quantum bit) is the quantum mechanical analogue of a classical bit.
- A classical binary bit can only represent a single binary value, such as 0 or 1.
- A qubit, however, can represent a 0, a 1, or any proportion of 0 and 1 in superposition of both states.
- In quantum computing the information is encoded in qubits.
