scholarly journals Stabilization of Transverse Modes for a High Finesse Near-Unstable Cavity

2019 ◽  
Vol 9 (21) ◽  
pp. 4580
Author(s):  
Jianji Liu ◽  
Jiachen Liu ◽  
Zhixiang Li ◽  
Ping Yu ◽  
Guoquan Zhang
Keyword(s):  
Single Photon ◽  
Laser Cavity ◽  
Dye Laser ◽  
Transverse Modes ◽  
Fabry Perot ◽  
Parametric Down Conversion ◽  
Unstable Cavity ◽  
High Finesse ◽  
Down Conversion ◽  
Hall Technique

We develop a method to lock a high-finesse near-unstable Fabry–Perot (FP) cavity (F = 7330) to a frequency stable dye laser operating at 605.78 nm using the Pound–Drever–Hall technique. The experimental results show the feasibility of locking this cavity to different transverse modes. This method links the external FP cavity to the dye laser cavity, and a 379 kHz final linewidth of the FP cavity is achieved. Such a near-unstable cavity is potentially useful for cavity-enhanced spontaneous parametric down-conversion to generate narrow-band single photon or photon pairs in different transverse modes.

scholarly journals Spectral characterization of SPDC-based single-photon sources for quantum key distribution

2021 ◽  
Author(s):  
Sabine Euler ◽  
Erik Fitzke ◽  
Oleg Nikiforov ◽  
Daniel Hofmann ◽  
Till Dolejsky ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Single Photon ◽  
Complex Structure ◽  
Key Distribution ◽  
Spectral Characterization ◽  
Single Photons ◽  
Transverse Modes ◽  
Parametric Down Conversion ◽  
Photon Spectra ◽  
Down Conversion

AbstractIn our laboratory, we employ two biphoton sources for quantum key distribution. The first is based on cw parametric down-conversion of photons at 404 nm in PPKTP waveguide chips, while the second is based on the pulsed parametric down-conversion of 775 nm photons in PPLN waveguides. The spectral characterization is important for the determination of certain side-channel attacks. A Hong-Ou-Mandel experiment employing the first photon source revealed a complex structure of the common Hong-Ou-Mandel dip. By measuring the spectra of the single photons at 808 nm, we were able to associate these structures to the superposition of different transverse modes of the pump photons in our waveguide chips. The pulsed source was characterized by means of single-photon spectra measured by a sensitive spectrum analyzer as well as dispersion-based measurements. Finally, we also describe Hong-Ou-Mandel experiments using the photons from the second source.

scholarly journals Background and Review of Cavity-Enhanced Spontaneous Parametric Down-Conversion

2019 ◽  
Vol 124 ◽  
Author(s):  
Oliver Slattery ◽  
Lijun Ma ◽  
Kevin Zong ◽  
Xiao Tang
Keyword(s):  
Single Photon ◽  
Nonlinear Crystal ◽  
Transition Frequency ◽  
Atomic Ensemble ◽  
Atomic Ensembles ◽  
Quantum Communications ◽  
Resonant Modes ◽  
Spectral Linewidth ◽  
Parametric Down Conversion ◽  
Down Conversion

Spontaneous parametric down-conversion (SPDC) in a nonlinear crystal has been a workhorse for the generation of entangled and correlated single-photon pairs used for quantum communications applications for nearly three decades. However, as a naturally broadband process, the ability of SPDC to interface with the very narrow energy transitions in atomic ensembles for implementing quantum memories, which are needed for quantum repeaters to extend the reach of quantum communications, was initially limited. To overcome this limitation, the process was enhanced by placing the nonlinear crystal inside a resonating cavity. This modified process has some important advantages, including narrowing the spectral linewidth of generated photons into brighter resonant modes of the cavity, and the ability to lock the desired mode of the cavity to the targeted transition frequency of the atomic ensemble. This paper presents an overview of the principle of cavity-enhanced SPDC, a review of works to date using this technique, and an example of one of these implementations.

scholarly journals Producing single-photon wave packets of the infrared spectrum range with an orbital angular momentum using “vortex” phase plates

2018 ◽  
Vol 190 ◽  
pp. 04025
Author(s):  
D.A. Turaykhanov ◽  
A.V. Shkalikov ◽  
A.A. Kalachev ◽  
I.R. Imangulova ◽  
N.N. Losevsky ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Single Photon ◽  
Diffractive Optical Elements ◽  
Axially Symmetric ◽  
Optical Elements ◽  
Parametric Down Conversion ◽  
Phase Plates ◽  
Photon States ◽  
Down Conversion

We consider the peculiarities of formation and registration of axially symmetric vortex fields in the context of applying diffractive optical elements such as vortex lenses and vortex axicons for the generation of single-photon states with a nonzero orbital angular momentum in the process of spontaneous parametric down-conversion.

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