Quantum computing is when we use the collective properties of quantum states, such as superposition, interference, and entanglement, to perform calculations. The devices that perform quantum computations are known as quantum computers.
A quantum computer is an emerging technology and is too dewy to outperform classical computers for practical applications but they are believed to solve certain computational problems faster than classical computers can ever do. the study of quantum computing is a subfield of quantum information science.
the first idea of quantum computing came in the year 1980 when physics paul Benioff proposed a quantum mechanical model of the turning machine.
Richard Feynman and Yuri Manin
later suggested that a quantum computer had the potential to simulate things a
classical computer could not feasibly do. In 1986 Feynman introduced an early
version of the quantum circuit notation. In 1994, Peter Shor developed a
quantum algorithm for finding the prime factors of an integer with the
potential to decrypt RSA-encrypted communications. In 1998 Isaac Chuang, Neil
Gershenfeld, and Mark Kubinec created the first two-qubit quantum computer that
could perform computations. Despite ongoing experimental progress since the
late 1990s, most researchers believe that "fault-tolerant quantum
computing is still a rather distant dream." In recent years, investment
in quantum computing research has increased in the public and private sectors.
On 23 October 2019, Google AI, in partnership with the U.S. National
Aeronautics and Space Administration (NASA), claimed to have performed a
quantum computation that was infeasible on any classical computer, but whether
this claim was or is still valid is a topic of active research.

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