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Art News Frequency – Chinese researchers have developed a pulsed optically pumped (POP) atomic clock with a frequency stability of 4.7 x 10

The achievement is remarkable because atomic clocks – often considered the most stable frequency standard for timekeeping – are critical components of global navigation systems and international communications services, and frequency stability is key to their accuracy.

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The research was led by Deng Jianliao of the Shanghai Institute of Optics and Fine Mechanics (SIOM) at the Chinese Academy of Sciences. The results were published in the Review of Scientific Instruments on April 21, 2020.

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“Atomic clocks use a quantum mechanical system as a ‘pendulum’ where the local oscillator frequency is locked to the transition between atomic energy states,” said Deng Jianliao, corresponding author of the paper. “The accuracy of the atomic clock depends on determining the accuracy of the atomic transition center and the stability of the center frequency itself.”

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The new design uses a compact optical module consisting of a Distributed Bragg Reflector (DBR) laser and an acousto-optic modulator in a POP vapor cell with a rubidium atomic clock.

Containing the ics package in a sealed vacuum chamber improved temperature control and also reduced the negative impact of the barometric effect.

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Dunn noted that the atomic clock is “sensitive to fluctuations in many parameters,” making it challenging to optimize medium- to long-term frequency stability in laser-based vapor cell clocks such as POP clocks.

Seconds achieved by the new design “is comparable to the state-of-the-art POP rubidium clock,” according to the study.

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More information: Qian Shen et al, A pulsed optically pumped atomic clock with medium- to long-term frequency stability of 10−15, Scientific Instruments Review (2020). DOI: 10.1063/5.0006187

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Citation: New POP atomic clock design achieves state-of-the-art frequency stability (2020, April 21) retrieved on April 18, 2023 from https:///news/2020-04-atomic-clock-state-of- the-art-frequency-stability.html

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This website uses cookies to help you navigate, analyze your use of our services, collect data to personalize ads and provide content from third parties. By using our site, you acknowledge that you have read and understood our privacy policy and terms of use. The Healing Through The Arts (HTTA) program gives women diagnosed with breast cancer and breast cancer survivors the opportunity to help themselves for a short time. and long-term recovery. Some activities include dragon boat training, Piloxing, Zumba, Qi Gong, sewing, yoga, art class and crochet. These activities are led by volunteers, most of whom are either breast cancer survivors or professionals in their respective fields.

Is dedicated to raising awareness of breast cancer, promoting early detection and providing support to people affected by the disease. We are able to work towards our goals and our mission to eradicate breast cancer as a life-threatening disease thanks to the support of corporate sponsors and well-wishers.

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Volunteers come from all walks of life, from students to professionals, organizations and survivors. We also provide training to our volunteers depending on their needs for the task assigned to them.

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Has a membership size of over 1,000 members made up of women diagnosed with breast cancer and breast cancer survivors and supporters. They participate in our programs and activities designed to meet their needs. They also play an active role in education, raising awareness of breast cancer and providing support to women diagnosed with and surviving breast cancer and their families. Last May, when Spotify launched Frequency – our global initiative and holistic destination to celebrate black magic, entertainment, creativity, culture and community both on and off the platform – we did so with the mission to create a space that showcases the broad spectrum of black artistry. Since then, listeners have tuned into Frequency music playlists like Ripple Effect and House Party and learned from the Heard You podcast playlist.

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We are committed to celebrating and uplifting Black culture, creativity and community throughout the year, with a special focus on the month of February in honor of Black History Month. This year we want to celebrate the multidimensionality of black listeners, artists and creators, truly embracing the breadth of black creativity – so we’ve created a space to bring it to life.

Introduction: Frequency presents the free studio. We’re building on Spotify’s existing commitment to black artists and creators by opening a short-term studio to host a diverse array of artists and creators. The space will consist of recording studios, video backdrops, green screen areas, blank canvases and more. It will provide a physical space to foster the creativity of emerging artists whose work is influencing mainstream culture. We will be posting more information soon, including the featured artists. In the meantime, check Frequency Hub on Spotify for recently updated playlists.

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In addition to The Free Studio, we are also continuing our commitments from previous years. In the spring of 2021, we reaffirmed our commitment to fighting racial inequality with a focus on organizations dedicated to inspiring, connecting, and elevating the next generation of Black voices and creators. Two of these partners are 4A’s Foundation and UNCF (United Negro College Fund). Our new fellowships with each organization help young Black artists at various stages of their artistic journeys gain access to education and career opportunities.

We’re also making sure listeners can find Black History Month-specific content on the platform. Stay tuned for new podcasts and special episodes of the following shows:

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The Spotify Greenroom is also a new, fun and educational resource for listeners who want to listen and learn this Black History Month.

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Spotify Original Greenroom Show The Grapevine Live is hosted by Ashley Acuna and Donovan Thompson. It is dedicated to driving the conversation around black culture, the black perspective, and current events. This month, Ashley and Donovan will be dedicating episodes of The Grapevine Live to different aspects of the black experience and black history with episodes focusing on:

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Finally, Spotify Canada will highlight black artists in underrepresented spaces by featuring artists like Julian Taylor, Fefe Dobson, Kaytranada and WondaGurl on the cover of various playlists across genres.

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This Black History Month, you can learn from new podcasts like Abolition X. Get a sneak peak with the trailer below.

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What’s new. Host Lauren Simmons gives her two cents about her upcoming show Money Moves. An international team of researchers has been able to show that the three-dimensional Dirac material cadmium arsenide (blue-red cone) can multiply the frequency of a strong terahertz pulse (red line) by a factor of seven. The reason for this is the free electrons (red dots) in the cadmium arsenide, which are accelerated by the electric field of the terahertz lightning and thus in turn emit electromagnetic radiation. Credit: Helmholtz-Zentrum Dresden-Rossendorf

Higher frequencies mean faster data transfer and more powerful processors – the formula that has driven the IT industry for years. Technically, though, it’s anything but just keep increasing clock speeds and radio frequencies. New materials can solve the problem. Experiments at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) have already yielded a promising result: An international team of researchers managed to obtain a new material to increase the frequency of a terahertz radiation flash by a factor of seven: a first step for potential IT applications, which the group reports in the journal Nature Communications.

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When smartphones receive data and computer chips perform calculations, such processes always involve alternating electric fields that send electrons along well-defined paths. Higher field frequencies mean the electrons can do their work faster, allowing for higher data transfer rates and higher processor speeds. The current frontier is the terahertz range, so researchers around the world are eager to understand how terahertz fields interact with new materials. “Our terahertz facility TELBE at HZDR is an outstanding source for studying these interactions in detail and identifying promising materials,” says Jan-Christoph Deinert from the HZDR Institute for Radiation Technology. “A possible candidate is, for example, cadmium arsenide.

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) belongs to the group of so-called three-dimensional Dirac materials, where electrons can interact very quickly and efficiently, both with each other and with rapidly oscillating alternating electric fields. “We were particularly interested in whether cadmium arsenide also emits terahertz radiation at new, higher frequencies,” explains TELBE beamline scientist Sergey Kovalev. “We have already observed this very successfully in graphene, a two-dimensional Dirac

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