The theory of quantum information and computing puts this significance on a firm footing, and has led to some profound and exciting new insights into the natural world. This is especially true in quantum mechanics. This has meant that the full significance of information as a basic concept in physics is only now being discovered. However, the mathematical treatment of information, especially information processing, is quite recent, dating from the mid-20th century. It therefore has a fundamentally important role in the science of physics.
![]() Quantum Information And Computation Journal Free To AssumeThe universal quantum computer (QC) is described, based on the Church-Turing principle and a network model of computation. Quantum cryptography is briefly sketched. This includes quantum algorithms, quantum communication, quantum cryptography, and theory of entanglement.In Quantum Information and Computation, papers have a natural home where authors will finally be free to assume a basic knowledge of concepts, such as quantum circuits and computational complexity.Basic quantum information ideas are next outlined, including qubits and data compression, quantum gates, the `no cloning' property and teleportation. The EPR-Bell correlations, and quantum entanglement in general, form the essential new ingredient which distinguishes quantum from classical information theory and, arguably, quantum from classical physics.The Quantum Information and Computation (QIC) Group at the Harish-Chandra Research Institute (HRI), Allahabad is involved in research on a wide spectrum of topics in quantum information and computation.![]() However, the principles of quantum information physics can be tested on smaller devices. This implies that some important computational tasks are impossible for any device apart from a QC.To build a universal QC is well beyond the abilities of current technology. Such algorithms prove that a QC of sufficiently precise construction is not only fundamentally different from any computer which can only manipulate classical information, but can compute a small class of functions with greater efficiency. Seymour skinlessIn fact such experiments are so difficult that it seemed likely until recently that a practically useful QC (requiring, say, 1000 qubits) was actually ruled out by considerations of experimental imprecision and the unavoidable coupling between any system and its environment. Among other things, these systems will allow the feasibility of quantum computing to be assessed. These allow coherent control in a Hilbert space of eight dimensions (three qubits) and should be extendable up to a thousand or more dimensions (10 qubits). QEC provides a means to detect and undo such departures without upsetting the quantum computation. Errors are almost certain to cause a departure from this subspace. The evolution of the QC is restricted to a carefully chosen subspace of its Hilbert space. This is quantum error correction (QEC).An introduction to QEC is provided.
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