Journal ArticleDOI
Realization of the Cirac–Zoller controlled-NOT quantum gate
Ferdinand Schmidt-Kaler,Hartmut Häffner,M. Riebe,S. Gulde,G.P.T. Lancaster,T. Deuschle,Christoph Becher,Christian F. Roos,Jürgen Eschner,Rainer Blatt +9 more
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TLDR
This work implements a CNOT quantum gate according to the Cirac–Zoller proposal, which relies on recently developed precise control of atomic phases and the application of composite pulse sequences adapted from nuclear magnetic resonance techniques.Abstract:
Quantum computers have the potential to perform certain computational tasks more efficiently than their classical counterparts. The Cirac–Zoller proposal1 for a scalable quantum computer is based on a string of trapped ions whose electronic states represent the quantum bits of information (or qubits). In this scheme, quantum logical gates involving any subset of ions are realized by coupling the ions through their collective quantized motion. The main experimental step towards realizing the scheme is to implement the controlled-NOT (CNOT) gate operation between two individual ions. The CNOT quantum logical gate corresponds to the XOR gate operation of classical logic that flips the state of a target bit conditioned on the state of a control bit. Here we implement a CNOT quantum gate according to the Cirac–Zoller proposal1. In our experiment, two 40Ca+ ions are held in a linear Paul trap and are individually addressed using focused laser beams2; the qubits3 are represented by superpositions of two long-lived electronic states. Our work relies on recently developed precise control of atomic phases4 and the application of composite pulse sequences adapted from nuclear magnetic resonance techniques5,6.read more
Citations
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Journal ArticleDOI
Ultracold atomic gases in optical lattices: mimicking condensed matter physics and beyond
TL;DR: In this article, the authors review recent developments in the physics of ultracold atomic and molecular gases in optical lattices and show how these systems may be employed as quantum simulators to answer some challenging open questions of condensed matter, and even high energy physics.
Journal ArticleDOI
Measurement-based quantum computation on cluster states
TL;DR: This work gives a detailed account of the one-way quantum computer, a scheme of quantum computation that consists entirely of one-qubit measurements on a particular class of entangled states, the cluster states, and proves its universality.
Journal ArticleDOI
Quantum simulations with trapped ions
TL;DR: In this paper, the authors present a review of experiments in controlling and manipulating trapped atomic ions, together with the methods and tools that have enabled them, and provide an outlook on future directions in the field.
Journal ArticleDOI
Strong coupling between surface plasmon polaritons and emitters: a review
TL;DR: This review looks at the concepts and state-of-the-art concerning the strong coupling of surface plasmon-polariton modes to states associated with quantum emitters such as excitons in J-aggregates, dye molecules and quantum dots.
Journal ArticleDOI
Entangled states of trapped atomic ions
TL;DR: Experiments show that just a few entangled trapped ions can be used to improve the precision of measurements, and if the entanglement in such systems can be scaled up to larger numbers of ions, simulations that are intractable on a classical computer might become possible.
References
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Proceedings ArticleDOI
Algorithms for quantum computation: discrete logarithms and factoring
TL;DR: Las Vegas algorithms for finding discrete logarithms and factoring integers on a quantum computer that take a number of steps which is polynomial in the input size, e.g., the number of digits of the integer to be factored are given.
Journal ArticleDOI
Quantum Computations with Cold Trapped Ions.
J. I. Cirac,Peter Zoller +1 more
TL;DR: A quantum computer can be implemented with cold ions confined in a linear trap and interacting with laser beams, where decoherence is negligible, and the measurement can be carried out with a high efficiency.
Journal ArticleDOI
Long-distance quantum communication with atomic ensembles and linear optics
TL;DR: It is shown that the communication efficiency scales polynomially with the channel length, and hence the scheme should be operable over very long distances.
Journal ArticleDOI
Long-distance quantum communication with atomic ensembles and linear optics
TL;DR: In this article, the authors describe a scheme that allows to implement robust quantum communication over long lossy channels, which involves laser manipulation of atomic ensembles, beam splitters and single-photon detectors with moderate efficiencies.
Journal ArticleDOI
The Physical Implementation of Quantum Computation
TL;DR: In this article, the requirements for the physical implementation of quantum computation are discussed, plus two relating to the communication of quantum information are extensively explored and related to the many schemes in atomic physics, quantum optics, nuclear and electron magnetic resonance spectroscopy, superconducting electronics, and quantum-dot physics, for achieving quantum computing.