scholarly journals Controlled On-Chip Single-Photon Transfer Using Photonic Crystal Coupled-Cavity Waveguides

2011 ◽  
Vol 2011 ◽  
pp. 1-13 ◽  
Author(s):  
Hubert Pascal Seigneur ◽  
Matthew Weed ◽  
Michael Niklaus Leuenberger ◽  
Winston Vaughan Schoenfeld
Keyword(s):  
High Efficiency ◽  
Nearest Neighbor ◽  
Single Photon ◽  
Tight Binding ◽  
Quantum Mechanical ◽  
Single Photons ◽  
Quantum Network ◽  
On Chip ◽  
Quantum Mechanical Approach ◽  
Coupled Cavity

To the end of realizing a quantum network on-chip, single photons must be guided consistently to their proper destination both on demand and without alteration to the information they carry. Coupled cavity waveguides are anticipated to play a significant role in this regard for two important reasons. First, these structures can easily be included within fully quantum-mechanical models using the phenomenological description of the tight-binding Hamiltonian, which is simply written down in the basis of creation and annihilation operators that move photons from one quasimode to another. This allows for a deeper understanding of the underlying physics and the identification and characterization of features that are truly critical to the behavior of the quantum network using only a few parameters. Second, their unique dispersive properties together with the careful engineering of the dynamic coupling between nearest neighbor cavities provide the necessary control for high-efficiency single-photon on-chip transfer. In this publication, we report transfer efficiencies in the upwards of 93% with respect to a fully quantum-mechanical approach and unprecedented 77% in terms of transferring the energy density contained in a classical quasibound mode from one cavity to another.

High Efficiency On-Chip Single-Photon Detection for Diamond Nanophotonic Circuits

2016 ◽  
Vol 34 (2) ◽  
pp. 249-255 ◽  
Author(s):  
Oliver Kahl ◽  
Simone Ferrari ◽  
Patrik Rath ◽  
Andreas Vetter ◽  
Christoph Nebel ◽  
...  
Keyword(s):  
High Efficiency ◽  
Single Photon ◽  
Single Photon Detection ◽  
Photon Detection ◽  
Nanophotonic Circuits ◽  
On Chip

scholarly journals Quasinormal mode theory and design of on-chip single photon emitters in photonic crystal coupled-cavity waveguides

2016 ◽  
Vol 24 (12) ◽  
pp. 13574 ◽  
Author(s):  
T. Malhotra ◽  
R.-C. Ge ◽  
M. Kamandar Dezfouli ◽  
A. Badolato ◽  
N. Vamivakas ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Single Photon ◽  
Quasinormal Mode ◽  
Mode Theory ◽  
Single Photon Emitters ◽  
On Chip ◽  
Coupled Cavity

scholarly journals Room-temperature on-chip orbital angular momentum single-photon sources

2022 ◽  
Vol 8 (2) ◽  
Author(s):  
Cuo Wu ◽  
Shailesh Kumar ◽  
Yinhui Kan ◽  
Danylo Komisar ◽  
Zhiming Wang ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Room Temperature ◽  
Single Photon ◽  
Single Photons ◽  
Photon Sources ◽  
On Chip

A room-temperature on-chip orbital angular momentum source that emits well-collimated single photons has been demonstrated.

Position-Sensitive Gaseous Photomultipliers Filled with Photosensitive Vapours

2016 ◽  
pp. 49-90
Keyword(s):  
High Efficiency ◽  
Single Photon ◽  
Photoelectric Effect ◽  
Electrical Signal ◽  
Single Electron ◽  
Single Photons ◽  
Weak Signal ◽  
History Of ◽  
Individual Photon ◽  
Position Sensitive

The ultimate goal of all development of photosensitive detectors is to find a detector capable of detecting single photons with high efficiency. Furthermore, the photon shall not only be detected as a photon somewhere. We want to know where it was with high precision in space, often down to a few micrometers. We want to know when it was there, preferably with a precision of less than a nanosecond. We want to know where and when for each individual photon in a high flux of photons. Sometimes we even want to know the polarization of each photon. Position-sensitive gaseous photomultipliers filled with photosensitive vapours are capable of all of this. It is a challenging task. A single photon is the weakest light there is. For UV and visible light the energy in the photon is so low that it can barely emit a single electron through photoelectric effect with a gas. This photoelectron has practically no kinetic energy when it is released. A single electron at rest is the weakest possible electrical signal there is, so the detector must be able to amplify this extremely weak signal without any noise. We will here describe the history of photosensitive gaseous detectors, their applications and what the state of the art technology is today.

scholarly journals An Easy-Implemented On-Chip Waveguide Coupled Single Photon Source Based on Self-Assembled Quantum Dots Membrane

2021 ◽  
Vol 11 (2) ◽  
pp. 695
Author(s):  
Ping Jiang ◽  
Na Ma ◽  
Peng Liu ◽  
Wenxuan Wu ◽  
Kai Zhang
Keyword(s):  
Quantum Dot ◽  
Cross Correlation ◽  
Single Photon ◽  
Photon Statistics ◽  
Single Photons ◽  
Single Photon Source ◽  
Photonic Circuit ◽  
On Chip ◽  
Photon Source ◽  
Scatter Light

In recent years, many groups and institutions have been committed to the research of integrated quantum photonic circuit technologies, of which the key components are waveguide coupled single photon sources. In this study, we propose an on-chip waveguide-coupled single photon source that is easily implemented as the waveguide is directly made from the quantum dot membrane. In order to scatter light out of the on-chip waveguide plane into the detection apparatus, grating output couplers are made at both ends of the waveguide. The photon statistics of the on-chip photon source were investigated by second-order correlation function g(2)(τ) measurements using a Hanbury Brown and Twiss interferometer. From the spectra and cross-correlation experiments by collecting emission at the point of quantum dot and out coupler, the emitting of single photons from the same quantum dot and propagating via the waveguide to the out couplers was confirmed. These results show that we have achieved an on-chip single photon source that is easily implemented and easily integrated into quantum photonic circuits.

scholarly journals Scalable integrated single-photon source

2020 ◽  
Vol 6 (50) ◽  
pp. eabc8268 ◽  
Author(s):  
Ravitej Uppu ◽  
Freja T. Pedersen ◽  
Ying Wang ◽  
Cecilie T. Olesen ◽  
Camille Papon ◽  
...  
Keyword(s):  
Quantum Information Processing ◽  
Single Photon ◽  
Long Strings ◽  
High Fidelity ◽  
Single Photons ◽  
Single Photon Source ◽  
Quantum Operations ◽  
Main Challenge ◽  
On Chip ◽  
Photon Source

Photonic qubits are key enablers for quantum information processing deployable across a distributed quantum network. An on-demand and truly scalable source of indistinguishable single photons is the essential component enabling high-fidelity photonic quantum operations. A main challenge is to overcome noise and decoherence processes to reach the steep benchmarks on generation efficiency and photon indistinguishability required for scaling up the source. We report on the realization of a deterministic single-photon source featuring near-unity indistinguishability using a quantum dot in an “on-chip” planar nanophotonic waveguide circuit. The device produces long strings of >100 single photons without any observable decrease in the mutual indistinguishability between photons. A total generation rate of 122 million photons per second is achieved, corresponding to an on-chip source efficiency of 84%. These specifications of the single-photon source are benchmarked for boson sampling and found to enable scaling into the regime of quantum advantage.

scholarly journals Indistinguishable Photons from a Single Molecule under Pulsed Excitation

2021 ◽  
Vol 255 ◽  
pp. 06002
Author(s):  
Pietro Lombardi ◽  
Maja Colautti ◽  
Rocco Duquennoy ◽  
Ghulam Murtaza ◽  
Prosenjit Majumder ◽  
...  
Keyword(s):  
Single Molecule ◽  
Single Photon ◽  
Low Cost ◽  
Photon Emission ◽  
Light Sources ◽  
Single Photons ◽  
Quantum Communications ◽  
Ideal Quantum ◽  
On Chip ◽  
Key Resources

Quantum light sources are crucial for the future of quantum photonic technologies and, among them, single photons on-demand are key resources in quantum communications and information processing. Ideal quantum emitters providing indistinguishable photons in a clocked manner, negligible decoherence and spectral diffusion, and with potential for scalability are today still a major challenge. We report on photostable and indistinguishable single photon emission from dibenzoterrylene molecules isolated in anthracene nanocrystals (DBT:Ac NCs) at 3K. The visibility of two-photon interference is preserved even when they are separated more than thirty times the excited-state lifetime, or ten fluorescence cycles. One of the advantages of organic molecules is the low-cost mass production of nominally identical emitters, that also allow for on-chip integration. These aspects combined with high spectral stability and coherence make them promising for applications and future quantum technologies.

Topology optimization of high-efficiency on-chip single photon sources

2021 ◽  
Author(s):  
Omer Yesilyurt ◽  
Zhaxylyk A. Kudyshev ◽  
Alexandra Boltasseva ◽  
Vladimir M. Shalaev ◽  
Alexander V. Kildishev
Keyword(s):  
Topology Optimization ◽  
High Efficiency ◽  
Single Photon ◽  
Photon Sources ◽  
On Chip

Formation and Binding Energies of Vacancy Clusters in Silicon

1997 ◽  
Vol 469 ◽  
Author(s):  
L. Colombo ◽  
A. Bongiorno ◽  
T. Diaz De La Rubia
Keyword(s):  
Molecular Dynamics ◽  
Large Scale ◽  
Tight Binding ◽  
Model Potential ◽  
Binding Energies ◽  
Quantum Mechanical ◽  
Interatomic Potentials ◽  
Mechanical Approach ◽  
Dynamics Simulations ◽  
Quantum Mechanical Approach

ABSTRACTWe critically readdress the problem of vacancy clustering in silicon by perform large-scale tight-binding molecular dynamics simulations. We also compare the results of this quantum-mechanical approach to the widely used model-potential molecular dynamics scheme based on the Tersoff and Stillinger-Weber interatomic potentials.

scholarly journals Quantum mechanics of proteins in explicit water: The role of plasmon-like solute-solvent interactions

2019 ◽  
Vol 5 (12) ◽  
pp. eaax0024 ◽  
Author(s):  
Martin Stöhr ◽  
Alexandre Tkatchenko
Keyword(s):  
Density Functional ◽  
Van Der Waals ◽  
Tight Binding ◽  
Quantum Mechanical ◽  
Dispersion Interactions ◽  
Many Body ◽  
Biomolecular Systems ◽  
Range Interaction ◽  
Factors Affecting ◽  
Quantum Mechanical Approach

Quantum-mechanical van der Waals dispersion interactions play an essential role in intraprotein and protein-water interactions—the two main factors affecting the structure and dynamics of proteins in water. Typically, these interactions are only treated phenomenologically, via pairwise potential terms in classical force fields. Here, we use an explicit quantum-mechanical approach of density-functional tight-binding combined with the many-body dispersion formalism and demonstrate the relevance of many-body van der Waals forces both to protein energetics and to protein-water interactions. In contrast to commonly used pairwise approaches, many-body effects substantially decrease the relative stability of native states in the absence of water. Upon solvation, the protein-water dispersion interaction counteracts this effect and stabilizes native conformations and transition states. These observations arise from the highly delocalized and collective character of the interactions, suggesting a remarkable persistence of electron correlation through aqueous environments and providing the basis for long-range interaction mechanisms in biomolecular systems.

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