Encoding arbitrary four-qubit states in the spatial parity of a photon pair
Name
Abouraddy-2012-Encoding arbitrary four-qubit states in the spatial parity of a photon pair.pdf
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Author(s)
Yarnall, Timothy M.
Abouraddy, Ayman F.
Di Giuseppe, Giovanni
Saleh, Bahaa E. A.
Teich, Malvin C.
Date Issued
June 2012
Journal
Physical Review A
Publisher
American Physical Society
Citation
Abouraddy, Ayman et al. “Encoding Arbitrary Four-qubit States in the Spatial Parity of a Photon Pair.” Physical Review A 85.6 (2012): 062317. © 2012 American Physical Society.
Version
Final published version
Abstract
Advancing quantum information processing is predicated on the preparation of ever-larger multiqubit states. Photonic realizations of such states may be achieved by increasing the number of photons populating the state or the number of qubits encoded per photon. Typical approaches to the latter strategy utilize distinct degrees of freedom of the photon field. We present here an approach that encodes two qubits per photon in the spatial parity of its transverse spatial profile. Simple linear optical devices transform each parity qubit separately or the two qubits jointly. Furthermore, we demonstrate that entangled photon pairs produced by spontaneous parametric down-conversion may be used to prepare arbitrary four-qubit states through sculpting the spatial profile of the classical optical pump. Two examples are highlighted—the preparation of two-photon four-qubit Greenberger-Horne-Zeilinger and W states, whose encoding in a photon pair has thus far eluded other approaches
MIT Department
Lincoln Laboratory
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.85.062317
