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Classical & quantum dynamics of information
Classical & quantum dynamics of information

... subsystems is then examined in some detail. Chapter 3 is based on papers (A) and (B) of the list of publications. Extended Landauer-like principles are developed, based amongst others on the conservation of information of divergenceless dynamical systems. Conservation of information within the frame ...
Niels Bohr as philosopher of experiment: Does
Niels Bohr as philosopher of experiment: Does

1. von Neumann Versus Shannon Entropy
1. von Neumann Versus Shannon Entropy

... measurement outcome has actually been realised. If we did that we would necessarily find just one of the states, q i , to which we would then assign an entropy of zero. The density matrix (3.2.5.2) does, however, account for the reduction of the wavepacket ; the irreversible, indeterminate, -process ...
agostino pr´astaro
agostino pr´astaro

Quantum Information Processing with
Quantum Information Processing with

- Philsci-Archive
- Philsci-Archive

... models for coin tosses (Keller, 1986; Strzalko et al., 2008) which may even be exploited to create biases in the outcomes of tosses (Diaconis, Holmes, and Montgomery, 2007). This then can be taken to suggest that an epistemic (ignorance) interpretation for these probabilities is more apt. Horses, on ...
A New and Feasible Protocol for Semi
A New and Feasible Protocol for Semi

... computational basis (and that were not discarded). If there is no noise or eavesdropping, this bit string should be the same for Alice and Bob. 9. Alice sends to Bob error correction information, and Bob corrects the errors in his bit string, so that it is the same as Alice’s. 10. Alice and Bob perf ...
Thesis - Archive ouverte UNIGE
Thesis - Archive ouverte UNIGE

On the Dynamics of Single-Electron Tunneling in Semiconductor
On the Dynamics of Single-Electron Tunneling in Semiconductor

Quantum Chaos, Transport, and Decoherence in Atom
Quantum Chaos, Transport, and Decoherence in Atom

Quantum Computer (Information) and Quantum Mechanical
Quantum Computer (Information) and Quantum Mechanical

... the processing of information (quantum computation) that the differentiation occurs. The ability to manipulate quantum information enables us to perform tasks that would be unachievable in a classical context, such as unconditionally secure transmission of information. Quantum information processing ...
Atoms, photons, and Information
Atoms, photons, and Information

Bulk Entanglement Spectrum Reveals Quantum
Bulk Entanglement Spectrum Reveals Quantum

Quantum Computing, Quantum Games and Geometric Algebra
Quantum Computing, Quantum Games and Geometric Algebra

... that perhaps the only way to solve complex quantum mechanical problems was by simulating them on some quantum mechanical system [Fey82], [Fey86], [RHA96]. This led to the idea by Deutsch of expanding the classical model of the Turing machine [Tur36] to a quantum Turing machine [Deu85] which could ut ...
Observation of topological links associated with Hopf
Observation of topological links associated with Hopf

Quantum quenches to the attractive one
Quantum quenches to the attractive one

... experimental control allows to directly probe their unitary time evolution [4–13]. A simple paradigm to study the non-equilibrium dynamics of closed many-body quantum systems is that of a quantum quench [14]: a system is prepared in an initial state (usually the ground state of some Hamiltonian H0 ) ...
Transport study on two-dimensional electrons with controlled short-range alloy disorder
Transport study on two-dimensional electrons with controlled short-range alloy disorder

For screen - Mathematical Sciences Publishers
For screen - Mathematical Sciences Publishers

Quantum Fingerprints that Keep Secrets
Quantum Fingerprints that Keep Secrets

... mapping x → (s, hs (x)), where hs is chosen at random from a 2-universal family of hash functions (s identifies hs inside the family). Quantum fingerprints have been introduced by Buhrman, Cleve, Watrous and de Wolf in [BCWdW01]. An n bits to d qubits quantum fingerprinting scheme is a mapping from ...
Quantum non-demolition - Quantum Optics and Spectroscopy
Quantum non-demolition - Quantum Optics and Spectroscopy

Categorical Models for Quantum Computing
Categorical Models for Quantum Computing

Discrete Approaches to Quantum Gravity in Four Dimensions
Discrete Approaches to Quantum Gravity in Four Dimensions

... phase structure, and the inclusion of matter, to name just a few. So far, they have not been successful in providing convincing evidence for the existence of a non-trivial four-dimensional quantum theory of gravity (neither, of course, have other methods). There are considerable technical difficulti ...
Chapter 7 Quantum Error Correction
Chapter 7 Quantum Error Correction

Optimal Detection of Symmetric Mixed Quantum States
Optimal Detection of Symmetric Mixed Quantum States

M12/16
M12/16

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Quantum computing



Quantum computing studies theoretical computation systems (quantum computers) that make direct use of quantum-mechanical phenomena, such as superposition and entanglement, to perform operations on data. Quantum computers are different from digital computers based on transistors. Whereas digital computers require data to be encoded into binary digits (bits), each of which is always in one of two definite states (0 or 1), quantum computation uses quantum bits (qubits), which can be in superpositions of states. A quantum Turing machine is a theoretical model of such a computer, and is also known as the universal quantum computer. Quantum computers share theoretical similarities with non-deterministic and probabilistic computers. The field of quantum computing was initiated by the work of Yuri Manin in 1980, Richard Feynman in 1982, and David Deutsch in 1985. A quantum computer with spins as quantum bits was also formulated for use as a quantum space–time in 1968.As of 2015, the development of actual quantum computers is still in its infancy, but experiments have been carried out in which quantum computational operations were executed on a very small number of quantum bits. Both practical and theoretical research continues, and many national governments and military agencies are funding quantum computing research in an effort to develop quantum computers for civilian, business, trade, and national security purposes, such as cryptanalysis.Large-scale quantum computers will be able to solve certain problems much more quickly than any classical computers that use even the best currently known algorithms, like integer factorization using Shor's algorithm or the simulation of quantum many-body systems. There exist quantum algorithms, such as Simon's algorithm, that run faster than any possible probabilistic classical algorithm.Given sufficient computational resources, however, a classical computer could be made to simulate any quantum algorithm, as quantum computation does not violate the Church–Turing thesis.
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