#rydberg

Rydberg’s probably one of my favorite characters in Starstruck. @mana-chan I hope you like it :)

Rydberg Photonics Launches in Berlin, Combining German Engineering and American Systems to Scale Quantum Technology

The well-known American quantum sensing business Rydberg Technologies Inc. established Rydberg Photonics GmbH in Berlin. The industrialisation of quantum technology depends on this. This strategic location is a powerful combination of U.S. quantum systems expertise and world-class German photonics engineering, with the aim of producing the next generation of micro-integrated components that are crucial for expanding the global quantum ecosystem.

Rydberg Photonics is a new company that is a dynamic spin-off from the prestigious Ferdinand-Braun-Institut (FBH), a well-known brand in high-frequency and high-power electronics and photonics. Providing compact, dependable, and high-performing micro-integrated photonic engines that will serve as the main power source and control system for quantum devices worldwide is the clear and ambitious objective of this new Berlin-based company.

Quantum-Scale Continental Connectivity: Strategic Justifications Rydberg Photonics' launch attempts to bridge laboratory-proven quantum principles and field-ready technology. It is regarded as a master class in international strategic cooperation. The core source of synergy is the combination of the distinctive features of the parent company and the organisation from which the spin-off is generated.

Rydberg Technologies Inc. offers its vast experience in developing cutting-edge quantum systems, particularly in the area of quantum sensing, which demands unparalleled accuracy and stability. Conversely, FBH provides over a decade of innovative research in micro-integrated photonics, as well as its unique expertise in hybrid micro-integration technology.

The significance of this combination was emphasised by Dr. David A. Anderson, CEO of Rydberg Technologies and co-founder of Rydberg Photonics. "This partnership is a strategic fusion that will significantly speed up global deployment, not just an expansion," he stated. He continued by saying that by fusing German technical expertise in photonics with American system development, the businesses are "positioned to deliver field-ready quantum and advanced photonic solutions at scale." He emphasised that the advancement of quantum discoveries from the lab to the international industrial, scientific, and commercial sectors depends on this partnership. Rydberg Technologies and Rydberg Photonics will collaborate in the US and European markets as key partners.

Breaking the Bottleneck of Quantum

The quantum industry has long recognised a major bottleneck: the most powerful quantum devices often rely on massive, power-hungry, vibration-sensitive optical equipment. Rydberg Photonics aims to get around this restriction by leveraging FBH's proven ability to condense complex optical components onto compact, robust modules.

This transition from benchtop complexity to micro-integrated, turnkey engines will enable the eventual deployment of clocks, sensors, and Quantum Communications in real-world environments. Manufacturing floors, data centres, aeroplanes, and spacecraft are examples of environments that are challenging to operate. The micro-integrated photonic engines are self-contained, easy to use, and sufficiently stable to perform well even under the most demanding conditions.

Technology's Edge: Accurate Miniaturisation

After nearly a decade of pioneering research at the FBH, Rydberg Photonics is concentrating on performance-preserving miniaturisation, a notoriously challenging subject in high-precision photonics. The main technological advantage of FBH is its unique hybrid micro-integration technique. This specialised technique allows for the exact and reliable assembly of a wide range of components, such as semiconductor lasers, optical fibres, and micro-optics, into a single, small, and robust platform.

The level of robustness achieved by this integration is inevitable for quantum systems. For example, an extremely stable laser source is needed in quantum computing to cool and manipulate individual atoms or ions. Any drift or instability in the photonics is strongly associated with errors in the quantum calculation. By offering components built for stability from the ground up, Rydberg Photonics is directly addressing one of the most persistent obstacles to the adoption of quantum technology.

Crucial Components of the Quantum Revolution

Rather than being auxiliary components, Rydberg Photonics' initial product offerings are the main workhorses of the modern quantum environment. Based on over a decade of FBH research, the company's first products will include:

Compact and Turnkey Optical Frequency References: These components act as the extraordinarily steady heartbeats of a quantum system. An optical frequency reference provides a very stable and precisely known frequency signal. This stability is crucial because reference atomic transitions determine how accurate atomic clocks are. Quantum clocks are portable for next-generation GPS-free navigation and extremely secure communication networks due to their reduced references.

Hybrid Integrated High-Power, Narrow-Linewidth Lasers Most cutting-edge quantum technologies, like the neutral atom and Rydberg-atom-based trapped-ion quantum computers, require highly specialised lasers. To properly measure atom energy changes, a narrow-linewidth laser must output pure-color light. Scientists cannot read, write, or store qubits without this precision. Rydberg Photonics is enabling the deployment of these powerful and complicated lasers outside of climate-controlled labs by substantially lowering their size and enhancing their mechanical and thermal stability through hybrid integration.

These specialised components are necessary for many different quantum applications:

Quantum sensors' sensitivity to gravity, electric, and magnetic forces could revolutionise medical diagnosis and subsurface surveys.

Quantum clocks provide exact time for portable atomic clocks for global synchronisation, military security, and financial trading.

Continuous light sources from Quantum Communications ensure future data security for Quantum Key Distribution (QKD) systems.

Control layers for neutral-atom and trapped-ion systems in quantum computing, where laser accuracy determines qubit fidelity.

The establishment of Rydberg Photonics in Berlin is a clear sign of the intensifying battle for the global commercialisation of quantum technology. Germany's strong industrial base and wealth of technological expertise, particularly in the areas of optics and photonics, make it the perfect place for this kind of manufacturing venture.

It is anticipated that the combination of U.S. system-level experience with German component-level accuracy will solve the industry's main integration issues. Rydberg Photonics seeks to lower supply chain risk for global quantum producers and help the quantum technology ecosystem move from research to commercial size and ubiquity by focused on these fundamental factors.

La longueur d’onde des raies émises par l’atome d’hydrogène est prédite par une formule appelée formule de Rydberg :

Cette formule généralise une formule empirique établie par Johann Balmer en 18885 à partir des raies de l’hydrogène dans le domaine visible. Le fondement théorique de cette formule ne fut découvert que plus tard, grâce aux travaux de Niels Bohr. Il démontra que les raies spectrales d’un atome correspondaient à des sauts quantiques entre les différents états d’énergie possible de ses électrons. Ces états d’énergie sont quantifiés et l’équation de Schrödinger permet de les déterminer. Chacun de ces sauts se traduit par l’émission d’un photon dont la longueur d’onde est inversement proportionnelle au différentiel d’énergie :

Dans le cas d’un atome d’hydrogène, on peut simplifier l’équation de Schrödinger en l’appliquant à un électron évoluant dans un potentiel coulombien. Il est possible alors possible de la résoudre analytiquement. On montre que l’écart entre les différents niveaux d’énergie possibles correspondent bien aux valeurs prédites par la formule de Rydberg. En astronomie, on a donné un nom aux différentes séries de raies spectrales de l’atome d’hydrogène :

La formule de Rydberg s’applique aussi aux atomes hydrogénoïdes. Les atomes hydrogénoïdes sont des cations dépouillés de tous leurs électrons sauf 1 (Li2+, Be3+...). Dans ce cas :

Z étant le numéro atomique de l’atome considéré, M sa masse atomique et me la masse de l’électron.

Lorsque les atomes possèdent plus d’un électron dans leur bande de valence, la formule de Rydberg ne s’applique plus. Il faut tenir compte d’un phénomène appelé couplage spin-orbite (voir le post à ce sujet).

Pour en savoir plus :

post sur la classification périodique des éléments

post sur le nuage électronique

post sur les nombres quantiques et les termes spectroscopiques

post sur l’effet Zeeman et l’expérience de Stern et Gerlach

post sur la raie à 21 cm de l’hydrogène

Vem är Gullveig som tre gånger blev bränd i ett dåd som blev starten för kriget mellan Asar och Vaner? Viktor Rydberg skingrar förvirringen på ett sätt som går tvärt emot många andra forskares teorier.

Asar och Vaner är två gudasläkter som i tidernas begynnelse utkämpade ett fruktansvärt krig. I Valans spådom berättas det om hur kriget började.

Det fältslag minns hon först i världen, när de med spjuten spetsade Gullveig och i den Höges sal henne brände. Tre gånger brände de den tre gånger borna, ofta, ej sällan, dock ännu hon lever.

Valans spådom, 21

Det har spekulerats en del i vem denna…

Scef - Den förste kungen Vi läser Viktor Rydberg och hittar en berättelse från bronsåldern. Den handlar om den förste kungen, Scef.

Jag har just förvärvat ett exemplar av Viktor Rydbergs bok Undersökningar i Germanisk Mythologie. Det är ett gigantiskt verk, där Rydberg verkligen försöker vända ut och in på hela den germanska mytologin, ända från den poetiska eddan fram till berättelserna om de olika kungasläktena. Syftet med dessa släktsagor var att förklara hur vikingatidens, och senare medeltidens kungar var besläktade med…