scholarly journals Bright correlated twin-beam generation and radiation shaping in high-gain parametric down-conversion with anisotropy

2021 ◽  
Author(s):  
Matvei Riabinin ◽  
Polina Sharapova ◽  
Torsten Meier
Keyword(s):  
High Gain ◽  
Beam Generation ◽  
Parametric Down Conversion ◽  
Twin Beam ◽  
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.

High-Gain Twin-Beam Generation in Waveguides: Experimental Characterization Using Cascaded Stimulated Emission

2020 ◽  
Author(s):  
Mihai D. Vidrighin ◽  
Gil Triginer ◽  
Nicolás Quesada ◽  
Andreas Eckstein ◽  
Merritt Moore ◽  
...  
Keyword(s):  
High Gain ◽  
Stimulated Emission ◽  
Experimental Characterization ◽  
Beam Generation ◽  
Twin Beam

scholarly journals Quantum-to-classical transition via fuzzy measurements on high-gain spontaneous parametric down-conversion

2010 ◽  
Vol 81 (3) ◽  
Author(s):  
Chiara Vitelli ◽  
Nicolò Spagnolo ◽  
Lorenzo Toffoli ◽  
Fabio Sciarrino ◽  
Francesco De Martini
Keyword(s):  
High Gain ◽  
Parametric Down Conversion ◽  
Classical Transition ◽  
Down Conversion

Angular degrees of freedom in twin-beam parametric down-conversion

2012 ◽  
Vol 101 (12) ◽  
pp. 121114 ◽  
Author(s):  
Martin Levenius ◽  
Valdas Pasiskevicius ◽  
Katia Gallo
Keyword(s):  
Degrees Of Freedom ◽  
Parametric Down Conversion ◽  
Twin Beam ◽  
Down Conversion

scholarly journals Quantum enhanced imaging of nonuniform refractive profiles

2019 ◽  
Vol 17 (08) ◽  
pp. 1941010 ◽  
Author(s):  
Giuseppe Ortolano ◽  
Ivano Ruo-Berchera ◽  
Enrico Predazzi
Keyword(s):  
The Other ◽  
Quantum Metrology ◽  
Experimental Demonstration ◽  
Similar Model ◽  
Spatial Profile ◽  
Parametric Down Conversion ◽  
Twin Beam ◽  
Down Conversion ◽  
Multimode Beams ◽  
Enhanced Imaging

In this work, quantum metrology techniques are applied to the imaging of objects with a nonuniform refractive spatial profile. A sensible improvement on the classical accuracy is shown to be found when the “Twin Beam (TWB) State” is used. In particular, exploiting the multimode spatial correlation, naturally produced in the Parametric Down Conversion (PDC) process, allows a 2D reconstruction of complex spatial profiles, thus enabling an enhanced imaging. The idea is to use one of the spatially multimode beams to probe the sample and the other as a reference to reduce the noise. A similar model can also be used to describe wave front distortion measurements. The model is meant to be followed by a first experimental demonstration of such enhanced measurement scheme.

scholarly journals Spectral properties of high-gain parametric down-conversion

2012 ◽  
Vol 20 (7) ◽  
pp. 7507 ◽  
Author(s):  
K. Yu. Spasibko ◽  
T. Sh. Iskhakov ◽  
M. V. Chekhova
Keyword(s):  
Spectral Properties ◽  
High Gain ◽  
Parametric Down Conversion ◽  
Down Conversion

scholarly journals Direct Schmidt number measurement of high-gain parametric down conversion

2015 ◽  
Vol 12 (6) ◽  
pp. 065202 ◽  
Author(s):  
I V Dyakonov ◽  
P R Sharapova ◽  
T Sh Iskhakov ◽  
G Leuchs
Keyword(s):  
Schmidt Number ◽  
High Gain ◽  
Parametric Down Conversion ◽  
Down Conversion
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