
Proceedings Paper
Multi-photon entanglement: from quantum curiosity to quantum computing and quantum repeatersFormat | Member Price | Non-Member Price |
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Paper Abstract
In the emerging field of quantum information technology the two basic subfields are quantum communication
and quantum computation. Photonic qubits are considered as most promising information carriers for this
new technology due to the immense advantage of suffering negligible decoherence. Additionally, the very small
photon-photon interactions can be replaced by inducing effective nonlinearities via measurements which allow for
the implementation of crucial two-qubit gate operations. Although the spontaneous parametric down-conversion
gives access to the generation of highly entangled few-photon states, such as four-qubit cluster states which
allow to demonstrate the new concept of the one-way quantum computer, its applicability is highly limited
due to the poor scaling of the simultaneous emission of more than one-entangled photon pair. Therefore of
particular interest is the reversible mapping of qubits from photon states to atomic states. This might allow
the implementation of photonic quantum repeaters for long-distance quantum communication or the generation
of arbitrary multi-photon states as required for linear-optics quantum computing. Thus for the realization of
such a quantum network several approaches for achieving the required quantum control between matter and
photons have been studied during the past few years. Recent experiments demonstrating the generation of
narrow-bandwidth single photons using a room-temperature ensemble of 87Rb atoms and electromagnetically
induced transparency should emphasize the progress towards such a quantum network.
Paper Details
Date Published: 31 August 2007
PDF: 13 pages
Proc. SPIE 6664, The Nature of Light: What Are Photons?, 66640G (31 August 2007); doi: 10.1117/12.736979
Published in SPIE Proceedings Vol. 6664:
The Nature of Light: What Are Photons?
Chandrasekhar Roychoudhuri; Al F. Kracklauer; Katherine Creath, Editor(s)
PDF: 13 pages
Proc. SPIE 6664, The Nature of Light: What Are Photons?, 66640G (31 August 2007); doi: 10.1117/12.736979
Show Author Affiliations
P. Walther, Harvard Univ. (United States)
M. D. Eisaman, Harvard Univ. (United States)
A. Nemiroski, Harvard Univ. (United States)
A. V. Gorshkov, Harvard Univ. (United States)
M. D. Eisaman, Harvard Univ. (United States)
A. Nemiroski, Harvard Univ. (United States)
A. V. Gorshkov, Harvard Univ. (United States)
A. S. Zibrov, Harvard Univ. (United States)
Harvard-Smithsonian Ctr. for Astrophysics (United States)
P.N. Lebedev Institute of Physics (Russia)
A. Zeilinger, Univ. of Vienna (Austria)
Institute for Quantum Optics and Quantum Information (Austria)
M. D. Lukin, Harvard Univ. (United States)
Harvard-Smithsonian Ctr. for Astrophysics (United States)
Harvard-Smithsonian Ctr. for Astrophysics (United States)
P.N. Lebedev Institute of Physics (Russia)
A. Zeilinger, Univ. of Vienna (Austria)
Institute for Quantum Optics and Quantum Information (Austria)
M. D. Lukin, Harvard Univ. (United States)
Harvard-Smithsonian Ctr. for Astrophysics (United States)
Published in SPIE Proceedings Vol. 6664:
The Nature of Light: What Are Photons?
Chandrasekhar Roychoudhuri; Al F. Kracklauer; Katherine Creath, Editor(s)
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