scholarly journals Coalescence of Single Photons Emitted by Disparate Single-Photon Sources: The Example of InAs Quantum Dots and Parametric Down-Conversion Sources

2011 ◽  
Vol 107 (15) ◽  
Author(s):  
Sergey V. Polyakov ◽  
Andreas Muller ◽  
Edward B. Flagg ◽  
Alex Ling ◽  
Natalia Borjemscaia ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Single Photon ◽  
Single Photons ◽  
Inas Quantum Dots ◽  
Parametric Down Conversion ◽  
Photon Sources ◽  
Down Conversion

scholarly journals Ultrabright single-photon sources

Photoniques ◽  
2017 ◽  
pp. 23-26
Author(s):  
Pascale Senellart ◽  
Valérian Giesz ◽  
Loic Lanco
Keyword(s):  
Communication Network ◽  
Quantum Dots ◽  
Solid State ◽  
Quantum Communication ◽  
Single Photon ◽  
Single Photons ◽  
Cryogenic Temperatures ◽  
Optical Microcavity ◽  
Photon Sources ◽  
Lithography Technique

The development of a quantum communication network will require sources that efficiently emit single photons. Now, using a new lithography technique that garnered a silver CNRS medal in 2014, it has recently proved possible to fabricate these sources using quantum dots (QDs), that is, artificial solid-state atoms. Performed at cryogenic temperatures, this technique makes it possible to position a single QD in the middle of an optical microcavity with nanometric precision.

Fabrication of InAs quantum dots in AlAs∕GaAs DBR pillar microcavities for single photon sources

2005 ◽  
Vol 97 (7) ◽  
pp. 073507 ◽  
Author(s):  
Bingyang Zhang ◽  
Glenn S. Solomon ◽  
Matthew Pelton ◽  
Jocelyn Plant ◽  
Charles Santori ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Single Photon ◽  
Inas Quantum Dots ◽  
Photon Sources

scholarly journals Highly indistinguishable heralded single-photon sources using parametric down conversion

2012 ◽  
Vol 20 (14) ◽  
pp. 15275 ◽  
Author(s):  
Masato Tanida ◽  
Ryo Okamoto ◽  
Shigeki Takeuchi
Keyword(s):  
Single Photon ◽  
Parametric Down Conversion ◽  
Photon Sources ◽  
Down Conversion

scholarly journals Spontaneous parametric down-conversion in chirped, aperiodically-poled crystals

2015 ◽  
Vol 13 (05) ◽  
pp. 1550032 ◽  
Author(s):  
X. Sánchez-Lozano ◽  
J. L. Lucio M.
Keyword(s):  
Single Photon ◽  
Nonlinear Crystal ◽  
Spectral Amplitude ◽  
Single Photons ◽  
Ppln Crystal ◽  
Temporal Properties ◽  
Photon Pairs ◽  
Spectral Components ◽  
Parametric Down Conversion ◽  
Down Conversion

We present a theoretical analysis of the process of spontaneous parametric down conversion (SPDC) in a nonlinear crystal characterized by a linearly-chirped χ(2) grating along the direction of propagation. Our analysis leads to an expression for the joint spectral amplitude, based on which we can derive various spectral–temporal properties of the photon pairs and of the heralded single photons obtained from the photon pairs, including: The single-photon spectrum (SPS), the chronocyclic Wigner function (CWF) and the Schmidt number. The simulations that we present are for the specific case of a collinear SPDC source based on a PPLN crystal with the signal and idler photons emitted close to the telecom window. We discuss the mechanism for spectral broadening due to the presence of a linearly chirped χ(2) grating, showing that not only the width but also to some extent the shape of the SPDC spectrum may be controlled. Also, we discuss how the fact that the different spectral components are emitted on different planes in the crystal leads to single-photon chirp.

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 Semiconductor single-photon sources: progresses and applications

Photoniques ◽  
2021 ◽  
pp. 40-43
Author(s):  
Pascale Senellart
Keyword(s):  
Quantum Dots ◽  
Quantum Computing ◽  
Single Photon ◽  
New Technology ◽  
Semiconductor Quantum Dots ◽  
Single Photons ◽  
Time Increase ◽  
Quantum Networks ◽  
Optical Microcavities ◽  
Photon Sources

Single photons are the cornerstones of many applications in quantum technologies, from quantum computing to quantum networks. A new technology for the generation of single-photons has recently emerged, allowing a ten-time increase in efficiency with near-unity quantum purity. These single-photon sources are based on semiconductor quantum dots in optical microcavities.

Recent advances on single photon sources based on single colloidal nanocrystals

2010 ◽  
Vol 18 (1) ◽  
pp. 1-9 ◽  
Author(s):  
M. Vittorio ◽  
F. Pisanello ◽  
L. Martiradonna ◽  
A. Qualtieri ◽  
T. Stomeo ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Single Photon ◽  
Life Time ◽  
Colloidal Quantum Dots ◽  
Optical Systems ◽  
Colloidal Nanocrystals ◽  
Single Photons ◽  
Light Emitting Devices ◽  
Photon Sources

AbstractSingle colloidal quantum dots (QDs) are increasingly exploited as triggered sources of single photons. This review reports on recent results on single photon sources (SPS) based on colloidal quantum dots, whose size, shape and optical properties can be finely tuned by wet chemistry approach. First, we address the optical properties of different colloidal nanocrystals, such as dots, rods and dot in rods and their use as single photon sources will be discussed. Then, we describe different techniques for isolation and positioning single QDs, a major issue for fabrication of single photon sources, and various approaches for the embedding single nanocrystals inside microcavities. The insertion of single colloidal QDs in quantum confined optical systems allows one to improve their overall optical properties and performances in terms of efficiency, directionality, life time, and polarization control. Finally, electrical pumping of colloidal nanocrystals light emitting devices and of NC-based single photon sources is reviewed.

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