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  • Applications of Atomic Ensembles In Distributed Quantum Computing

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    Author(s)
    Zwierz, Marcin
    Kok, Pieter
    Griffith University Author(s)
    Zwierz, Marcin
    Year published
    2010
    Metadata
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    Abstract
    Thesis chapter. The fragility of quantum information is a fundamental constraint faced by anyone trying to build a quantum computer. A truly useful and powerful quantum computer has to be a robust and scalable machine. In the case of many qubits which may interact with the environment and their neighbors, protection against decoherence becomes quite a challenging task. The scalability and decoherence issues are the main difficulties addressed by the distributed model of quantum computation. A distributed quantum computer consists of a large quantum network of distant nodes - stationary qubits which communicate via flying ...
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    Thesis chapter. The fragility of quantum information is a fundamental constraint faced by anyone trying to build a quantum computer. A truly useful and powerful quantum computer has to be a robust and scalable machine. In the case of many qubits which may interact with the environment and their neighbors, protection against decoherence becomes quite a challenging task. The scalability and decoherence issues are the main difficulties addressed by the distributed model of quantum computation. A distributed quantum computer consists of a large quantum network of distant nodes - stationary qubits which communicate via flying qubits. Quantum information can be transferred, stored, processed and retrieved in decoherence-free fashion by nodes of a quantum network realized by an atomic medium - an atomic quantum memory. Atomic quantum memories have been developed and demonstrated experimentally in recent years. With the help of linear optics and laser pulses, one is able to manipulate quantum information stored inside an atomic quantum memory by means of electromagnetically induced transparency and associated propagation phenomena. Any quantum computation or communication necessarily involves entanglement. Therefore, one must be able to entangle distant nodes of a distributed network. In this article, we focus on the probabilistic entanglement generation procedures such as well-known DLCZ protocol. We also demonstrate theoretically a scheme based on atomic ensembles and the dipole blockade mechanism for generation of inherently distributed quantum states so-called cluster states. In the protocol, atomic ensembles serve as single qubit systems. Hence, we review single-qubit operations on qubit defined as collective states of atomic ensemble. Our entangling protocol requires nearly identical single-photon sources, one ultra-cold ensemble per physical qubit, and regular photodetectors. The general entangling procedure is presented, as well as a procedure that generates in a single step Q-qubit GHZ states with success probability p_success ~ ?^Q/2, where ? is the combined detection and source efficiency. This is significantly more efficient than any known robust probabilistic entangling operation. The GHZ states form the basic building block for universal cluster states, a resource for the one-way quantum computer.
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    Journal Title
    International Journal of Quantum Information
    Volume
    8
    Issue
    1-2
    DOI
    https://doi.org/10.1142/S0219749910006046
    Copyright Statement
    Electronic version of an article published in International Journal of Quantum Information, Vol. 8(1-2), 2010, pp. 181-218, http://dx.doi.org/10.1142/S0219749910006046. Copyright World Scientific Publishing Company http://www.worldscinet.com/ijqi/
    Subject
    Quantum Optics
    Quantum Physics not elsewhere classified
    Quantum Information, Computation and Communication
    Mathematical Sciences
    Physical Sciences
    Information and Computing Sciences
    Publication URI
    http://hdl.handle.net/10072/42737
    Collection
    • Journal articles

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