CALCULATION OF EFFECTIVE NONLINEAR COEFFICIENT IN BIBO FOR SPONTANEOUS PARAMETRIC DOWN CONVERSION

2013 ◽  
Vol 22 (01) ◽  
pp. 1350010 ◽  
Author(s):  
GUANGWEN HUO ◽  
TONGYI ZHANG ◽  
GUANGHUA CHENG ◽  
WEI ZHAO
Keyword(s):  
Nonlinear Crystal ◽  
Nonlinear Coefficient ◽  
Phase Matching ◽  
Double Phase ◽  
Parametric Down Conversion ◽  
Entangled Photon Pairs ◽  
Effective Phase ◽  
Matching Schemes ◽  
Down Conversion ◽  
Effective Nonlinear Coefficient

We theoretically investigate the effective nonlinear coefficient d eff of spontaneous parametric down-conversion (SPDC) process in biaxial nonlinear crystal BiB3O6 (BIBO). We solve the Fresnel equations in the collinear degenerate down-converted configuration, and get the relations of phase-matching angles. Considering the double phase-matching, we compute the phase-matching angles with different wavelength. Furthermore, we simplify the expression of effective nonlinear coefficient out of the principal planes, and numerically calculate it varying with the angle and wavelength. These results indicate that there are three effective phase-matching schemes for SPDC which can be used to construct a system to generate entangled photon pairs.

scholarly journals PARAMETRIC DOWN-CONVERSION IN PHOTONIC CRYSTAL WAVEGUIDES

2006 ◽  
Vol 20 (11n13) ◽  
pp. 1543-1550 ◽  
Author(s):  
GREGOR WEIHS
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Phase Matching ◽  
Dispersion Characteristics ◽  
Photonic Crystal Waveguides ◽  
High Brightness ◽  
Parametric Down Conversion ◽  
Matching Schemes ◽  
Down Conversion ◽  
Very High

Photonic crystals create dramatic new possibilities for nonlinear optics. I suggest to use defect waveguides for the production of pairs of photons in order to achieve particular dispersion characteristics and potentially very high brightness. I identify two possible phase-matching schemes and discuss their properties and advantages.

Theoretical analysis of collinear spontaneous parametric down conversion properties in BiB3O6

2014 ◽  
Vol 23 (02) ◽  
pp. 1450021
Author(s):  
Meizhi Zhang ◽  
Guangwen Huo
Keyword(s):  
Dielectric Dispersion ◽  
Phase Matching ◽  
Biaxial Crystal ◽  
Type I ◽  
Type Ii ◽  
Entangled Photons ◽  
Parametric Down Conversion ◽  
Effective Phase ◽  
Down Conversion

In this paper, we report on the collinear spontaneous parametric down conversion (SPDC) with quantum theory in angle picture. Based on angle-dependent refractive index of biaxial crystal and the dielectric dispersion, we numerically simulate the effective nonlinear coefficients of BiB 3 O 6 (BIBO) crystal in principle planes. The results indicate that the most effective phase matching scheme is the type I in yz plane, while the secondary options are the type I, type II in xz plane. Considering the derivation of angular phase matching conditions, the calculation is convenient, and it is superior in determination of the spatial distribution of entangled photons.

scholarly journals Spectrally multiplexed and ultrabright entangled photon pairs in a lithium niobate microresonator

2021 ◽  
Author(s):  
Bo-Yu Xu ◽  
Li-Kun Chen ◽  
Jintian Lin ◽  
Lan-Tian Feng ◽  
Rui Niu ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Single Photon ◽  
Phase Matching ◽  
Quantum Networks ◽  
Broad Bandwidth ◽  
Photon Pairs ◽  
Parametric Down Conversion ◽  
Entangled Photon Pairs ◽  
On Chip ◽  
Down Conversion

Abstract On-chip bright quantum sources with multiplexing ability are extremely high in demand for the integrated quantum networks with unprecedented scalability and complexity. Here, we demonstrate an ultrabright and broadband biphoton quantum source generated in a lithium niobate microresonator system. Without introducing the conventional domain poling, the on-chip microdisk produces entangled photon pairs covering a broad bandwidth promised by natural phase matching in spontaneous parametric down conversion. Experimentally, the multiplexed photon pairs are characterized by 30 nm bandwidth limited by the filtering system, which can be furthered enlarged. Meanwhile, the generation rate reaches 5.13 MHz/μW with a coincidence-to- accidental ratio up to 804. Besides, the quantum source manifests the prominent purity with heralded single photon correlation g(2)H(0)=0.0098±0.0021 and energy-time entanglement with excellent interference visibility of 96.5%±1.9%.

Justifying the thin-crystal approximation in spontaneous parametric down-conversion for collinear phase matching

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
Baghdasar Baghdasaryan ◽  
Fabian Steinlechner ◽  
Stephan Fritzsche
Keyword(s):  
Phase Matching ◽  
Parametric Down Conversion ◽  
Down Conversion ◽  
Thin Crystal

scholarly journals Coherently controlled quantum features in a coupled interferometric scheme

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Byoung S. Ham
Keyword(s):  
Optical Materials ◽  
Bell Inequality ◽  
Third Order ◽  
Deterministic Method ◽  
Photon Pairs ◽  
Wave Nature ◽  
Parametric Down Conversion ◽  
Pair Generation ◽  
Entangled Photon Pairs ◽  
Down Conversion

AbstractOver the last several decades, entangled photon pairs generated by spontaneous parametric down conversion processes in both second-order and third-order nonlinear optical materials have been intensively studied for various quantum features such as Bell inequality violation and anticorrelation. In an interferometric scheme, anticorrelation results from photon bunching based on randomness when entangled photon pairs coincidently impinge on a beam splitter. Compared with post-measurement-based probabilistic confirmation, a coherence version has been recently proposed using the wave nature of photons. Here, the origin of quantum features in a coupled interferometric scheme is investigated using pure coherence optics. In addition, a deterministic method of entangled photon-pair generation is proposed for on-demand coherence control of quantum processing.

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