Quantum computing exploits the laws of quantum mechanics to solve the problems which are too complex for classical computers.

In quantum computing, the information is coded in quantum bits or qubits. These are sub-atomic particles which can exist in more than one distinct state simultaneously or in both the states. Binary bits in classical computers exist in two states separately.

Enterprises are keen to enter quantum computing space. So far there is no feasible revenue model for quantum computing resources. Its use has been restricted to high-end research and large projects.

Quantum computing is becoming slowly accessible by innovations in chip technology and hardware design. In revenues, there are subscription and as-a-service models from corporates such as MS Azure, AWS, IBM, HPE.

Companies in India such as TCS, Wipro, Tech Mahindra, Mphasis and Fractal are investing in and experimenting with quantum computing. There is work on post-quantum security and technologies such as quantum key distribution (QKD). QKD is a secure communication method. It implements cryptographic protocols using components of quantum mechanics.

There are no general purpose quantum computers for the industry at present. They are still a few years away. They will be a reality depending on some research breakthroughs. At present, quantum inspired technology is available as a cloud service for enterprises.

Commercialisation would require quantum computers of the order of several thousands to several millions of qubits, whereas what is currently available is in hundreds.