Entanglement Degree Characterization of Spontaneous Parametric-Down Conversion Biphotons in Frequency Domain

Giorgio Brida; Valentina Caricato; Marco Genovese; Marco Gramegna; Mikhail Fedorov; Sergey Kulik

Quantum Communication and Quantum Networking. First International Conference, QuantumComm 2009, Naples, Italy, October 26-30, 2009, Revised Selected Papers

Research Article

Entanglement Degree Characterization of Spontaneous Parametric-Down Conversion Biphotons in Frequency Domain

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@INPROCEEDINGS{10.1007/978-3-642-11731-2_6,
    author={Giorgio Brida and Valentina Caricato and Marco Genovese and Marco Gramegna and Mikhail Fedorov and Sergey Kulik},
    title={Entanglement Degree Characterization of Spontaneous Parametric-Down Conversion Biphotons in Frequency Domain},
    proceedings={Quantum Communication and Quantum Networking. First International Conference, QuantumComm 2009, Naples, Italy, October 26-30, 2009, Revised Selected Papers},
    proceedings_a={QUANTUMCOMM},
    year={2012},
    month={10},
    keywords={Entanglement biphotons SPDC},
    doi={10.1007/978-3-642-11731-2_6}
}

Giorgio Brida
Valentina Caricato
Marco Genovese
Marco Gramegna
Mikhail Fedorov
Sergey Kulik
Year: 2012
Entanglement Degree Characterization of Spontaneous Parametric-Down Conversion Biphotons in Frequency Domain
QUANTUMCOMM
Springer
DOI: 10.1007/978-3-642-11731-2_6

Giorgio Brida¹, Valentina Caricato^,*, Marco Genovese¹, Marco Gramegna¹, Mikhail Fedorov², Sergey Kulik³

1: I.N.RI.M. - Istituto Nazionale di Ricerca Metrologica
2: Russian Academy of Science
3: M.V.Lomonosov Moscow State University

*Contact email: v.caricato@inrim.it

Abstract

We present an experiment addressed to verify the validity of the entanglement quantifier , defined as the ratio between single counts and coincidence distribution width for pure biphoton states ge-nerated by short pump pulses. We demonstrate that this ratio can be efficient to estimate entanglement degree in frequency domain. Our work has been performed with a femto second pulsed laser pump addressed to a LiIO crystal generating correlated biphotons through collinear degenerate type-I SPDC. To study the dependence of on the length of the crystal we performed two sequence of measurements for each crystal firstly with a 10 mm and then with a 5 mm.

Keywords: Entanglement biphotons SPDC

Published: 2012-10-11

: http://dx.doi.org/10.1007/978-3-642-11731-2_6