30 December, 2021
12 Min Read
Part of: GS Prelims and GS-III- S&T (Editorial plus)
What is this technology?
Quantum computers perform calculations based on the probability of an object's state before it is measured - instead of just 1s or 0s - which means they have the potential to process exponentially more data compared to classical computers.
Classical computers carry out logical operations using the definite position of a physical state. These are usually binary, meaning its operations are based on one of two positions. A single state - such as on or off, up or down, 1 or 0 - is called a bit.
In Quantum computers, operations instead use the quantum state of an object to produce what's known as a qubit. These states are the undefined properties of an object before they've been detected, such as the spin of an electron or the polarisation of a photon.
Rather than having a clear position, unmeasured quantum states occur in a mixed 'superposition', not unlike a coin spinning through the air before it lands in your hand.
These superpositions can be entangled with those of other objects, meaning their final outcomes will be mathematically related even if we don't know yet what they are.
The complex mathematics behind these unsettled states of entangled 'spinning coins' can be plugged into special algorithms to make short work of problems that would take a classical computer a long time to work out... if they could ever calculate them at all.
Such algorithms would be useful in solving complex mathematical problems, producing hard-to-break security codes, or predicting multiple particle interactions in chemical reactions.
Types of quantum computers
Building a functional quantum computer requires holding an object in a superposition state long enough to carry out various processes on them.
Unfortunately, once a superposition meets with materials that are part of a measured system, it loses its in-between state in what's known as decoherence and becomes a boring old classical bit.
Devices need to be able to shield quantum states from decoherence, while still making them easy to read.
Different processes are tackling this challenge from different angles, whether it's to use more robust quantum processes or to find better ways to check for errors.
Quantum computing supremacy
For the time being, classical technology can manage any task thrown at a quantum computer. Quantum supremacy describes the ability of a quantum computer to outperform their classical counterparts.
Some companies, such as IBM and Google, claim we might be close, as they continue to cram more qubits together and build more accurate devices.
Union Budget 2020-21 proposed to spend ?8,000 crore ($ 1.2 billion) on the newly launched National Mission on Quantum Technologies and Applications (NMQTA). The mission seeks to develop quantum computing linked technologies amidst the second quantum revolution and make India the world’s third biggest nation in the sector after the US and China.
Quantum Technologies not just have ultra fast computing capabilities, but it also has strategic and economic advantages.
What is Quantum Computing?
Applications of Quantum Technology
Besides computing, exploring the quantum world promises other dramatic applications. For example:
With NMQTA announcement, the government seeks to provide investment on a massive scale and on a par with similar programmes announced recently by the United States and Europe. However, there is an urgent need to address challenges associated with Quantum technology.Pursuing these challenges will require:
Source: TH/IE/Science web
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