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dc.contributor.authorZwierz, Marcinen_US
dc.contributor.authorKok, Pieteren_US
dc.date.accessioned2017-05-03T16:06:11Z
dc.date.available2017-05-03T16:06:11Z
dc.date.issued2010en_US
dc.date.modified2012-06-07T22:16:13Z
dc.identifier.issn02197499en_US
dc.identifier.doi10.1142/S0219749910006046en_US
dc.identifier.urihttp://hdl.handle.net/10072/42737
dc.description.abstractThesis 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.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_US
dc.format.extent845665 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.language.isoen_US
dc.publisherWorld Scientific Publishing Co. Pte. Ltd.en_US
dc.publisher.placeSingaporeen_US
dc.relation.ispartofstudentpublicationNen_US
dc.relation.ispartofpagefrom181en_US
dc.relation.ispartofpageto218en_US
dc.relation.ispartofissue1-2en_US
dc.relation.ispartofjournalInternational Journal of Quantum Informationen_US
dc.relation.ispartofvolume8en_US
dc.rights.retentionYen_US
dc.subject.fieldofresearchQuantum Opticsen_US
dc.subject.fieldofresearchQuantum Physics not elsewhere classifieden_US
dc.subject.fieldofresearchQuantum Information, Computation and Communicationen_US
dc.subject.fieldofresearchcode020604en_US
dc.subject.fieldofresearchcode020699en_US
dc.subject.fieldofresearchcode020603en_US
dc.titleApplications of Atomic Ensembles In Distributed Quantum Computingen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.rights.copyrightElectronic 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/en_US
gro.date.issued2010
gro.hasfulltextFull Text


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