Practical scheme for non-postselection entanglement concentration using linear optical elements
نویسندگان
چکیده
منابع مشابه
A Practical Scheme for Entanglement Concentration
We present a realistic purification scheme for pure non-maximally entangled states. In the scheme, Alice and Bob at two distant parties first start with two shared but less entangled photon pairs to produce a conditional four-photon GHZ state, then perform a 45◦ polarization measurement onto one of the two photons at each party such that the remaining two photons are projected onto a maximally ...
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Recently, entanglement concentrations have been experimently demonstrated by post-selection ( T. Yamamoto et al, Nature, 421, 343(2003), and Z. Zhao et al, Phys. Rev. Lett., 90,207901(2003) ), i.e., to each individual outcome state, one has to destroy it to know whether it has been purified. Here we give proposal for entanglement concentration without any post selection by using only practicall...
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Entanglement has played a key role in many quantum information processing, such as quantum computation [1], quantum teleportation [2], quantum dense coding [3], and entanglement-assisted quantum cryptography [4]. To function optimally these applications requires maximally entanglement. However, unwanted coupling to the environment causes the degradation of entanglement and entanglement concentr...
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In recent years, the quantum engineering of light have received much attention, which is mainly motivated by the potential improvement offered by quantum mechanics to the manipulation and the transmission of information. In particular, some conditional schemes have been suggested to prepare superpositions. Among these we mention the Fock filtering by an active Fabry-Perot cavity [1], the displa...
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We report a two-photon interference experiment that realizes a postselection-free test of Bell’s inequality based on energy-time entanglement. In contrast with all previous experiments of this type, the employed entangled states are obtained without the use of a beam splitter or a short coincidence window to ‘‘throw away’’ unwanted amplitudes. A ~95.061.4!% interference fringe visibility is obs...
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ژورنال
عنوان ژورنال: Physics Letters A
سال: 2007
ISSN: 0375-9601
DOI: 10.1016/j.physleta.2007.04.098