Quantum computers are all over

the news, but what are they and how do they differ from

conventional computing? If they can be built

economically and at scale quantum computers will

harness properties that extend beyond the

limits of classical physics to offer us exponential

gains in computing power. Classical computers are made

of bits, a unit of information that can either be a 0 or a 1. But in a quantum computer, the

basic unit, known as a qubit, can represent both 0 and 1 at

the same time, a state known as superposition. By stringing together

qubits the number of states that they

could represent rises exponentially,

enabling it to compute millions of possibilities

instantaneously. The applications of

this type of machine could revolutionise fields

from cryptography to chemistry, ranging from materials

science, agriculture, and pharmaceuticals, not to

mention artificial intelligence and energy. So far, the challenge

has been to scale up the number of qubits to

perform useful calculations while reducing the

number of errors that the qubits are prone to. This week Google has

published a landmark paper in the scientific

journal Nature. It claims to have

built a processor that can perform a very specific

calculation in 200 seconds that would take today’s most

powerful computer 10,000 years to complete. This demonstration is

known as quantum supremacy. This is just the first

step towards creating a useful quantum computer. Next, scientists will have to

build a scaled-up version that can perform real world, useful

calculations, thus achieving the promise of

quantum computing.

## 6 Comments

## Financial Times

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## ForAmerican

Financial Times is the source of fake news.

## Eli Eli

Quantum is 10-20 years away

## MEanME

Not the best top.

## paul hoskin

When it happens it will mean the end of the human race

## dinesh saini

incorrect info