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Acta Sinica Quantum Optica

Summarization of Investigation in Mechanism of Spontaneous Parametric Down-Conversion and Its Applications

Jianjun Li

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

Spontaneous parametric down-conversion is a non-classical optical field,which is generated by the interaction on nonlinear crystal of monochromatic flux of pumping photons and quantum vacuum noise.In this paper,the generation mechanism of spdc light field is interpreted by theory of quantum mechanics;the interpretation by classical theory is also given here.The paper also introduces roundly the non-classical characteristics and application advances of spdc light field in laser,remote sensing and quantum communication.Last but not least,SPDC′s application prospect and its developing direction are also given in this paper.

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JSAP-OSA Joint Symposia•Jan 1, 2024•0 citations
Spontaneous parametric down-conversion is a non-classical optical field,which is generated by the interaction on nonlinear crystal of monochromatic flux of pumping photons and quantum vacuum noise.In this paper,the generation mechanism of spdc light field is interpreted by theory of quantum mechanics;the interpretation by classical theory is also given here.The paper also introduces roundly the non-classical characteristics and application advances of spdc light field in laser,remote sensing and quantum communication.Last but not least,SPDC′s application prospect and its developing direction are also given in this paper.
Correlated photons are generated in spontaneous parametric down-conversion(SPDC) effect of nonlinear crystal pumped by highly intensity laser.Generation mechanism of correlated photons is explained compendiously by theory of quantum mechanics;interpretation of classical optics is also shown.The theory of detector calibration in quantum efficiency based correlated photons method is demonstrated.Comparing with traditional methods,the advantages of it are pointed out.The latest advances in the field are described here;fundamental ideas,advantages and disadvantages of these methods are analyzed.The next direction of investigation and the method of realization are mentioned.The future of this field is also presented in this paper.
Parametric Down Conversion (PDC) is a very important resource for what concern the development of quantum technologies and for experiments about foundation of quantum mechanics. The interest about this phenomenon is due to the fact that photons emitted by PDC are quantum correlated in many parameters and it is possible to use the PDC to produce states of light with strong non-classical behaviour. The aim of this paper is provide an extensive review on the theory of Parametric Down Conversion whit particular emphasis for what concern the case of Spontaneous Parametric Down Conversion (SPDC) in bulk non-linear crystals.
Summary form only given. Pairs of entangled photons display a complex quantum state that cannot be represented through a product of single-particle states. The spontaneous parametric down-conversion (SPDC) process, that takes place when a laser pulse pumps a second-order nonlinear crystal has become recently a convenient source of such nonclassical states of light in quantum optics experiments. Nonstationary effects are mainly observed when the pump pulse temporal duration is significantly shorter than the characteristic interaction time in the nonlinear crystal. We introduce a nonstationary theory of SPDC to describe the results of fourth-order quantum-interference experiments when no spectral filtering is applied to the down-converted fields. Experiments involving nonlinear SPDC crystals with three different lengths were performed. The ultraviolet laser pulses were obtained from a Ti:sapphire femtosecond laser with a second-harmonic generator. These pulses were used to pump nonlinear crystals to initiate the process of nonstationary spdc and generate orthogonally-polarized photon pairs. These pairs then went into a polarization interferometer, and the coincidence counts of the detectors at the two output ports of the interferometer were recorded.
Spontaneous parametric down conversion (SPDC) is one of the most versatile techniques for the generation of correlated photon pair, whose quantum state is essential for photon entanglement that underpins many quantum applications like secure communication, quantum metrology and lithography and quantum imaging [1]. Inverse design of effective SPDC has been achieved by structured crystals with shaped pump beams [2]. Another popular platform for SPDC is nanofabricated structures with sub-wavelength thickness called metasurfaces, as they could achieve drastic enhancement of nonlinear light-matter interactions [3]. There remains the possibility to use inverse design to optimize metasurfaces for SPDC.