An international team of scientists recently made a breakthrough in retaining the quantum coherence of quantum dot spin qubits.

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.