Journal ArticleDOI
A one-way quantum computer.
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A scheme of quantum computation that consists entirely of one-qubit measurements on a particular class of entangled states, the cluster states, which are thus one-way quantum computers and the measurements form the program.Abstract:
We present a scheme of quantum computation that consists entirely of one-qubit measurements on a particular class of entangled states, the cluster states. The measurements are used to imprint a quantum logic circuit on the state, thereby destroying its entanglement at the same time. Cluster states are thus one-way quantum computers and the measurements form the program.read more
Citations
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Atom detection and photon production in a scalable, open, optical microcavity.
TL;DR: The cavity design combines the intrinsic scalability of microfabrication processes with direct coupling of the cavity field to single-mode optical waveguides or fibers to build an optical microcavity network on an atom chip for applications in quantum information processing.
Journal ArticleDOI
Chip-based photon quantum state sources using nonlinear optics
Lucia Caspani,Chunle Xiong,Benjamin J. Eggleton,Daniele Bajoni,Marco Liscidini,Matteo Galli,Roberto Morandotti,David J. Moss +7 more
TL;DR: In this paper, the authors review recent developments in the realisation of integrated sources of photonic quantum states, focusing on approaches based on nonlinear optics that are compatible with contemporary optical fibre telecommunications and quantum memory infrastructures as well as with chip-scale semiconductor technology.
Journal ArticleDOI
Contextuality and Wigner-function negativity in qubit quantum computation
Robert Raussendorf,Dan E. Browne,Nicolas Delfosse,Nicolas Delfosse,Nicolas Delfosse,Cihan Okay,Juan Bermejo-Vega,Juan Bermejo-Vega +7 more
TL;DR: In this article, the authors describe schemes of quantum computation with magic states on qubits for which contextuality and negativity of the Wigner function are necessary resources possessed by the magic states.
Journal ArticleDOI
Exploring quantum matter with ultracold atoms in optical lattices
TL;DR: In this paper, a review of a series of experiments with ultracold quantum gases in optical lattices is presented, showing that the granularity of the matter wave field, caused by the discreteness of atoms, gives rise to effects going beyond the simple single matter wave description.
Journal ArticleDOI
Parallelizing quantum circuits
Anne Broadbent,Elham Kashefi +1 more
TL;DR: A novel automated technique is presented for the first time a full characterization of patterns with flow of arbitrary depth, based on the notion of influencing walks and a simple rewriting system on the angles of the measurement, which proves a logarithmic separation in terms of quantum depth between the quantum circuit model and the measurement-based model.
References
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Journal ArticleDOI
Elementary gates for quantum computation.
Adriano Barenco,Charles H. Bennett,Richard Cleve,David P. DiVincenzo,Norman Margolus,Peter W. Shor,Tycho Sleator,John A. Smolin,Harald Weinfurter +8 more
TL;DR: U(2) gates are derived, which derive upper and lower bounds on the exact number of elementary gates required to build up a variety of two- and three-bit quantum gates, the asymptotic number required for n-bit Deutsch-Toffoli gates, and make some observations about the number of unitary operations on arbitrarily many bits.
Journal ArticleDOI
Quantum information and computation
TL;DR: In information processing, as in physics, the classical world view provides an incomplete approximation to an underlying quantum reality that can be harnessed to break codes, create unbreakable codes, and speed up otherwise intractable computations.
Journal ArticleDOI
Good quantum error-correcting codes exist
A. R. Calderbank,Peter W. Shor +1 more
TL;DR: The techniques investigated in this paper can be extended so as to reduce the accuracy required for factorization of numbers large enough to be difficult on conventional computers appears to be closer to one part in billions.
Journal ArticleDOI
Error Correcting Codes in Quantum Theory.
TL;DR: It is shown that a pair of states which are, in a certain sense, “macroscopically different,” can form a superposition in which the interference phase between the two parts is measurable, providing a highly stabilized “Schrodinger cat” state.
Journal ArticleDOI
Demonstrating the viability of universal quantum computation using teleportation and single-qubit operations
TL;DR: It is shown that single quantum bit operations, Bell-basis measurements and certain entangled quantum states such as Greenberger–Horne–Zeilinger (GHZ) states are sufficient to construct a universal quantum computer.