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Photon Pairs (photon + pair)

Distribution by Scientific Domains
Physics and Astronomy100%

Kinds of Photon Pairs

  • entangled photon pair
    		•

    Selected Abstracts

    Entangled photon pairs from radiative cascades in semiconductor quantum dots

    PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 15 2006
    N. Akopian
    Abstract Entangled photon pairs are emitted from a biexciton decay cascade of single quantum dots when spectral filtering is applied. We show this by experimentally measuring the density matrix of the polarization state of the photon pair emitted from a continuously pumped quantum dot. The matrix clearly satisfies the Peres criterion for entanglement. By applying in addition a temporal window, the quantum dot becomes an entangled light source. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

    Generation of single photons and correlated photon pairs using InAs quantum dots

    FORTSCHRITTE DER PHYSIK/PROGRESS OF PHYSICS, Issue 11-12 2004
    C. Santori
    This article reviews recent work on non-classical light generation using semiconductor quantum dots. Experimental results for single-photon generation are presented, including suppression of the two-photon probability, coherence properties and two-photon interference. An experiment demonstrating generation of polarization-correlated photon pairs from biexciton recombination is also reviewed. [source]

    Multiphoton entanglement and interferometry

    FORTSCHRITTE DER PHYSIK/PROGRESS OF PHYSICS, Issue 4-5 2003
    M. Bourennane
    Multiphoton entanglement is the basis of many quantum communication schemes, quantum cryptographic protocols, and fundamental tests of quantum theory. Spontaneous parametric down-conversion is the most effective source for polarization entangled photon pairs. Here we show, that a class of entangled 4-photon states can be directly created by parametric down-conversion. These states exhibit perfect quantum correlations and a high robustness of entanglement against photon loss. Therefore these states are well suited for new types of quantum communication. [source]

    Biphoton spectroscopy of YAG:Er3+ crystal

    LASER PHYSICS LETTERS, Issue 10 2007
    A.A. Kalachev
    Abstract The absorption spectrum of Er3+ ions in YAG crystal in the range from 645 nm to 655 nm was measured with the resolution of 0.01 nm using the frequency-anticorrelated broadband photon pairs (biphotons) generated by spontaneous parametric down-conversion. The spectrum of the sample was measured by counting the coincidences when the impurity crystal was placed in front of the signal photon detector, whilst the wavelength of the idler photons was resolved by a monochromator which was placed in front of another photon detector. The results are in agreement with those obtained by the usual intensity measurements with a classical light source and a monochromator. It was shown experimentally that the biphoton spectroscopy, unlike the usual single photon spectroscopy, allows one to obtain the spectroscopic information in the presence of an external noise such as background thermal radiation. (© 2007 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

    Entangled photon pairs from radiative cascades in semiconductor quantum dots

    PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 15 2006
    N. Akopian
    Abstract Entangled photon pairs are emitted from a biexciton decay cascade of single quantum dots when spectral filtering is applied. We show this by experimentally measuring the density matrix of the polarization state of the photon pair emitted from a continuously pumped quantum dot. The matrix clearly satisfies the Peres criterion for entanglement. By applying in addition a temporal window, the quantum dot becomes an entangled light source. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

    Single-photon and photon-pair emission from CdSe/Zn(S,Se) quantum dots

    PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 2 2003
    S. Strauf
    Abstract We report on the generation of triggered single photons and photon pairs relying on pulsed optical excitation of epitaxially grown self-assembled CdSe quantum dots (QDs). Single-photon emission is studied on individual CdSe/Zn(S,Se) QDs for temperatures up to 200 K. At low temperatures nearly perfect single-photon emission is achieved whereas at higher temperatures an increasing multi-photon emission probability due to spectrally overlapping acoustic phonon sidebands of neighboring QDs is observed. The multi-photon emission probability of a bare QD (background subtracted) is strongly suppressed. Furthermore, the polarization cross correlation of the biexciton,exciton cascade has been investigated in a CdSe/ZnSe QD at low temperatures. A strong polarization correlation of the emitted photon pairs of ,74% is observed in a linear detection basis. [source]

    Degree of entanglement of photon pairs generated from V-type system in microcavity

    PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 2 2009
    Hiroshi Ajiki
    Abstract We propose polarization-entangled photon generation via resonant hyper-parametric scattering of a V-type system in microcavity. Although a bare V-type system cannot generate entangled photon pairs, microcavity makes the generation possible because of the formation of dressed states. In the strong-coupling limit, generation of non-entangled co-polarized photons is considerably suppressed due to the photon blockade effect. Furthermore, some entangled photons have different frequencies from those of the input fields, and thus, we can utilize spectral filtering in order to extract entangled photons. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

    Origin of asymmetric splitting of a neutral exciton in a single semiconductor quantum dot

    PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 11 2006
    I. Suemune
    Abstract It is well-recognized that exciton-state energy splitting makes it difficult to generate entangled photon pairs (EPP) from a single quantum dot (QD). It will be shown that the splitting of the exciton states originates from not only QD anisotropy but also ionization of residual impurities. This result shows that the growth of highly pure barrier layers will be necessary for the generation of EPP. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]