scholarly journals Azimuthal distinguishability of entangled photons generated in spontaneous parametric down-conversion

2007 ◽  
Vol 15 (22) ◽  
pp. 14636 ◽  
Author(s):  
Clara I. Osorio ◽  
Gabriel Molina-Terriza ◽  
Blanca G. Font ◽  
Juan P. Torres
Keyword(s):  
Entangled Photons ◽  
Parametric Down Conversion ◽  
Down Conversion

scholarly journals Quantum-enhanced interferometry with large heralded photon-number states

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
G. S. Thekkadath ◽  
M. E. Mycroft ◽  
B. A. Bell ◽  
C. G. Wade ◽  
A. Eckstein ◽  
...  
Keyword(s):  
Photon Number ◽  
Optical Loss ◽  
High Gain ◽  
Phase Sensitivity ◽  
Entangled Photons ◽  
Fundamental Limits ◽  
Parametric Down Conversion ◽  
Photonic States ◽  
Quantum Phenomena ◽  
Down Conversion

Abstract Quantum phenomena such as entanglement can improve fundamental limits on the sensitivity of a measurement probe. In optical interferometry, a probe consisting of N entangled photons provides up to a $$\sqrt{N}$$ N enhancement in phase sensitivity compared to a classical probe of the same energy. Here, we employ high-gain parametric down-conversion sources and photon-number-resolving detectors to perform interferometry with heralded quantum probes of sizes up to N = 8 (i.e. measuring up to 16-photon coincidences). Our probes are created by injecting heralded photon-number states into an interferometer, and in principle provide quantum-enhanced phase sensitivity even in the presence of significant optical loss. Our work paves the way toward quantum-enhanced interferometry using large entangled photonic states.

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.

Integrated entangled photons source from microcavity parametric down conversion

2012 ◽  
Vol 29 (8) ◽  
pp. 1884 ◽  
Author(s):  
Wei-Jian Chen ◽  
Fang-Wen Sun ◽  
Chang-Ling Zou ◽  
Guang-Can Guo
Keyword(s):  
Entangled Photons ◽  
Parametric Down Conversion ◽  
Down Conversion
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