scholarly journals Generalized Hermite–Gauss decomposition of the two-photon state produced by spontaneous parametric down conversion

2012 ◽  
Vol 45 (16) ◽  
pp. 165502 ◽  
Author(s):  
S P Walborn ◽  
A H Pimentel
Keyword(s):  
Photon State ◽  
Two Photon ◽  
Parametric Down Conversion ◽  
Gauss Decomposition ◽  
Down Conversion

Creating high-dimensional time-bin entanglement using mode-locked lasers

2002 ◽  
Vol 2 (6) ◽  
pp. 425-433
Author(s):  
H. de Riedmatten ◽  
I. Marcikic ◽  
H. Zbinden ◽  
N. Gisin
Keyword(s):  
High Dimensional ◽  
Photon State ◽  
Two Photon ◽  
Length Difference ◽  
Fabry Perot ◽  
Parametric Down Conversion ◽  
Path Length Difference ◽  
Mode Locked Lasers ◽  
Down Conversion ◽  
Feasible Experiment

We present a new scheme to generate high dimensional entanglement between two photonic systems. The idea is based on parametric down conversion with a sequence of pump pulses generated by a mode-locked laser. We prove experimentally the feasibility of this scheme by performing a Franson-type Bell test using a 2-way interferometer with path-length difference equal to the distance between 2 pump pulses. With this experiment, we can demonstrate entanglement for a two-photon state of at least dimension D=11. Finally, we propose a feasible experiment to show a Fabry-Perot like effect for a high dimensional two-photon state.

scholarly journals Generation of Pure State Photon Triplets in the C-Band

Micromachines ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 775 ◽  
Author(s):  
Xi-Rong Su ◽  
Yi-Wen Huang ◽  
Tong Xiang ◽  
Yuan-Hua Li ◽  
Xian-Feng Chen
Keyword(s):  
Pure State ◽  
Schmidt Number ◽  
Second Order ◽  
Conversion Process ◽  
Gaussian Filter ◽  
Periodically Poled ◽  
Two Photon ◽  
Parametric Down Conversion ◽  
Photon States ◽  
Down Conversion

In this work, the cascaded second-order spontaneous parametric down-conversion (SPDC) is considered to produce pure state photon triplets in periodically poled lithium niobite (PPLN) doped with 5% MgO. A set of parameters are optimized through calculating the Schmidt number of two-photon states generated by each down-conversion process with different pump durations and crystal lengths. We use a Gaussian filter in part and obtain three photons with 100% purity in spectrum. We provide a feasible and unprecedented scheme to manipulate the spectrum purity of photon triplets in the communication band (C-band).

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