• Prof. Amit Kumar Sharma

The promise of quantum computation is that quantum computers possess the ability to efficiently execute algorithms which are so difficult for classical computers that executing them becomes impractical even for very small inputs. These are not merely algorithms of theoretical interest only, but problems of great practical import. Yet despite the great promise of this field, many aspects of quantum computation remain a mystery. Quantum computers are not universally superior to classical computers, for there are many algorithms which are difficult for classical computers which have been shown to be equally difficult for quantum computers. Conversely, there are some problems which were previously believed to be solvable in practical time only by quantum computers, but efficient classical algorithms were eventually discovered, disproving quantum superiority for those problems. In fact, it is still not even well-understood why quantum computers are more powerful than their classical counterparts. These mysteries and setbacks notwithstanding, there are some quantum algorithms which are provably superior to the best possible classical counterparts, and still more quantum algorithms for which no efficient classical analogue is known to exist despite extensive research. This proven computational superiority, even if its full scope remains uncertain, has been sufficient to spur tremendous interest and research in this field.

Quantum Computing, Qubit, Decoherence, Shor’s Algorithms, NMR, MRI, Quantum Dot

"An Overview: Quantum Computing", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 3, page no.151-158, March-2019, Available :http://www.jetir.org/papers/JETIRAI06024.pdf

"An Overview: Quantum Computing", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 3, page no. pp151-158, March-2019, Available at : http://www.jetir.org/papers/JETIRAI06024.pdf