Articles tagged with Atomic Clocks
The 2019 Blavatnik National Laureates are Heather J. Lynch from Stony Brook University, a theoretical physicist from University of Colorado Boulder, and a chemical biologist from Harvard University. They were recognized for their innovative work in predicting penguin colony population growth and collapse due to climate change.
Physicists at NIST have demonstrated a compact, high-stability chip-scale atomic clock using rubidium atoms and frequency combs. The clock requires minimal power and has the potential to replace traditional oscillators in navigation systems and telecommunications networks.
Researchers have achieved record-breaking accuracy with an optical clock, setting a new standard for cesium-referenced measurements. The high accuracy of optical clocks could support advances in timing systems used in navigation and communication systems, enabling more precise measurements of physical phenomena not yet fully understood.
Scientists tested the symmetry of space-time by comparing two atomic clocks, confirming their excellent accuracy and a fundamental hypothesis of the theory of relativity. The experiment improved the limits for testing space-time symmetry by a factor of 100.
Researchers in the EPic Lab have made a breakthrough in developing a crucial element of an atomic clock, improving efficiency by 80%. The technology has the potential to revolutionize navigation systems, potentially replacing satellite mapping like GPS within 20 years.
Scientists developed a new ultra-low-power quantum atomic clock that outperforms industry standards in size, stability, and power consumption. The device has a long-term Allan deviation of 2.2x10^-12 at 10^5 seconds and occupies only 15.4 cm^3, making it suitable for small satellites.
The new NIST clock records set three important measures: systematic uncertainty, stability, and reproducibility. The clocks' total error drops below our general ability to account for gravity's effect on time here on Earth. This achievement enables the detection of faint signals from the early universe and perhaps dark matter.
Researchers have isolated groups of a few atoms and precisely measured their multi-particle interactions within an atomic clock. The study reveals unexpected results when three or more atoms are together, including nonlinear shifts in the clock's frequency and long-lived entangled states.
Physicists at NIST have performed the most accurate test of Einstein's general relativity theory using remote atomic clocks. The experiment confirmed that measurements of nongravitational effects are independent of time and place, with a result consistent with predicted values.
Researchers propose lutetium as a superior element for atomic clocks, offering lower sensitivity to temperature. This could lead to more accurate and stable timekeeping, with potential applications in fundamental physics and global positioning systems.
Researchers at PTB have successfully measured some important properties of the thorium-229 nucleus using optical methods, bringing scientists closer to developing an optical nuclear clock. This breakthrough uses laser excitation to monitor the nucleus's behavior and could lead to a more precise atomic clock.
Researchers at NICT Space-Time Standards Laboratory demonstrate a novel time scale generation method combining an optical lattice clock with a hydrogen maser. The resultant signal continued for half a year without interruption, outperforming Coordinated Universal Time (UTC) and TT(BIPM) in terms of accuracy.
Researchers use a transportable optical atomic clock to measure gravitation for the first time, with potential applications in monitoring continental height changes and improving national height systems. The technique has the potential to resolve height differences as small as 1 cm across the Earth's surface.
Researchers demonstrated reliable transmission of stable frequency references over 300km fiber optic networks, enabling synchronization of radio telescopes. This technology could benefit astronomy, particularly for the Square Kilometer Array (SKA), allowing scientists to access the frequency standard anywhere.
A new architecture miniaturizes atomic clocks using piezoelectric thin film vibration, achieving 30% reduction in chip area and 50% reduction in power consumption. The technology enables high-end frequency standards to be incorporated into wireless devices like smartphones.
PTB physicists have developed a frequency-doubling unit that can endure transportation and maintain accuracy. The unit is based on a highly stable monolithic enhancement cavity for second harmonic generation, enabling reliable laser light for quantum-optical experiments.
Researchers from University of Nevada, Reno used GPS satellites to search for dark matter clumps in the shape of walls or bubbles extending far beyond the solar system. The team found no evidence but ruled out a vast region of possibilities for this type of dark matter model, bringing them closer to defining its nature and composition.
JILA physicists have created an entirely new design for an atomic clock, packing strontium atoms into a tiny 3-D cube at 1,000 times the density of previous clocks. This approach enables a globally interacting collection of atoms to constrain collisions and improve measurements, leading to higher precision.
HRL Laboratories has developed a reversible alkali atom source that runs at low power and low voltage, enabling smaller and more efficient atomic clocks. The device can capture and cool rubidium atoms near absolute zero, reducing measurement noise and increasing accuracy.
Researchers from PTB and JILA develop a laser with an unprecedented 10 mHz linewidth, setting a new world record. The precision of the laser allows for accurate measurements in optical atomic clocks and spectroscopy.
Researchers at JILA used an advanced atomic clock to mimic the behavior of crystalline solids, demonstrating a novel 'off-label' use for atomic clocks. The study reveals potential applications in spintronics and quantum computing.
Physicists at NIST have combined two experimental atomic clocks based on ytterbium atoms to set a new world record for clock stability. The dual-clock design eliminates dead time and noise, resulting in a more powerful tool for precision tests and applications.
Researchers successfully tested an optical clock in space, demonstrating its potential to improve GPS accuracy and enable global sensing applications. The compact frequency comb laser system operated smoothly under microgravity conditions, paving the way for future space-based precision clocks.
Researchers have developed an optical frequency divider with unprecedented precision, enabling arbitrary optical frequency conversions. This breakthrough paves the way for improved applications in optics, metrology, and atomic physics.
The superradiant laser uses synchronized emissions of light from strontium atoms to improve atomic clock performance and create precise 'rulers' for space science. The laser's output is expected to be less sensitive to noise, making it sharper as a precision tool.
A team of researchers has successfully demonstrated the synchronization of optical clocks across a low-lying, strongly turbulent, 12-km horizontal air path using a frequency comb. They achieved femtosecond-level clock synchronization by measuring the arrival time of pulses at each site and correcting for the finite speed of light.
High-precision optical clocks in Europe are connected via a 1400 km optical fibre link, confirming excellent quality of the connection. The connection allows for ultrastable high-precision optical reference signals to be disseminated to various users.
Physicists at NIST create a quantum simulator by entangling up to 219 beryllium ions, enabling simulations that challenge classical computers. The technique also helps improve atomic clocks and models complex physics phenomena.
Optical atomic clocks have shown improved accuracy and stability compared to traditional microwave clocks, making them suitable for global timekeeping. By combining optical clocks with masers, researchers achieved a time error of less than 0.20 nanoseconds over 25 days.
The NIST Internet Time Service serves much of the world, receiving 316 million unique IP address requests from 20 servers in one month. This represents at least 8.5 percent of devices on the entire internet, highlighting its importance as a reliable source of time.
Researchers at PTB have developed an optical lattice clock with neutral strontium atoms, achieving the best stability worldwide thanks to a newly designed laser system. The clock has reached a fractional frequency instability of 8 E-17 and attains the quantum projection noise limit with as few as 130 atoms.
Scientists from PTB reduce the measurement uncertainty of their ytterbium clock to 3 E-18, exceeding predictions by Hans Dehmelt in 1981. The achievement showcases the accuracy and stability of optical atomic clocks.
The JILA strontium atomic clock has achieved unprecedented precision and stability levels, outperforming previous world records by more than three times. This breakthrough enables the measurement of tiny changes in time and gravity, with applications in advanced communications, positioning technologies, and relativistic geodesy.
Researchers at MIT have developed a technique to entangle 3,000 atoms using a single photon, promising improved accuracy in atomic clocks. This breakthrough could lead to more precise timekeeping and potentially overcome the standard quantum limit.
Researchers at the University of Copenhagen have developed a method that reduces the noise in atomic clocks, enabling them to be even more precise. The new technique uses a quantum frequency filter to sort out unwanted wavelengths of light, resulting in a laser beam that is much more stable and precise.
The newly developed optical atomic clock boasts extraordinary precision, with an error of less than one second in tens of millions of years. The clock's stability is ensured by advanced physical mechanisms, allowing it to maintain accuracy over extended periods.
Researchers developed two cryogenically cooled optical lattice clocks that can synchronize to a one part in 2.0 x 10^-18, nearly 1,000 times more precise than current international timekeeping standard. This precision could enable clock-based geodesy and measure the strength of gravitational potential at different locations.
Researchers at PTB compared caesium and ytterbium atomic clocks, finding no detectable change in the mass ratio of protons to electrons up to a relative uncertainty of one part in ten million per year. This suggests fundamental constants remain stable over long periods.
Scientists propose a novel method to detect dark matter using GPS satellites and atomic clock networks. The approach compares times from the clocks and looks for discrepancies, which could indicate the presence of dark matter.
Researchers at MIT and Draper Laboratory have developed a new atomic timekeeping approach that could enable more stable and accurate portable atomic clocks. The system suppresses the AC Stark shift effect, allowing for smaller, less expensive devices with improved accuracy compared to current fountain clocks.
Researchers at JILA have confirmed the presence of spin symmetry in strontium atoms, which could lead to breakthroughs in simulating exotic materials and understanding quantum phenomena like superconductivity. The discovery was made possible by an ultra-stable atomic clock, allowing for precise measurements of atom interactions.
Researchers from NIST and Caltech have created an atomic clock using a microcomb, enabling precise frequency control and conversion to microwave frequencies. The new design has the potential to be integrated into portable tools for calibrating telecommunications systems and improving radar navigation and scientific instruments.
A new theoretical study by Marianna Safronova and colleagues identifies 10 highly charged ions, including samarium-14+ and neodymium-10+, suitable for atomic timekeeping and quantum information schemes. The researchers provide estimates of ion properties needed for experiments, enabling the development of more accurate clocks and qubits.
The National Institute of Standards and Technology (NIST) has launched NIST-F2, an atomic clock that is three times more accurate than its predecessor, NIST-F1. The new clock will help improve technology innovations in fields like cellular telephones, GPS satellite receivers, and the electric power grid.
The JILA strontium lattice clock has set new world records for both precision and stability, achieving a precision of about 50% more than the record holder. Its stability is comparable to that of NIST's ytterbium atomic clock, allowing it to outperform other types of atomic clocks through averaging.
Physicists at NIST create a compact atomic clock design that relies on cold rubidium atoms, promising improved precision and stability. The new design has the potential to be smaller and more precise than existing chip-scale atomic clocks.
Researchers from Garching and Braunschweig transport frequencies with high precision over almost 2000 km to accurately determine the geoid of the Earth. The new technology allows for a height difference of 4 mm between clocks to be resolved within 100 seconds.
The NIST ytterbium atomic clocks have achieved a new record for stability, with an error rate of less than two parts in 1 quintillion. This breakthrough has significant implications for timekeeping and sensor applications, enabling rapid measurements in real-time.
Researchers at JILA have discovered that an atomic clock can mimic the behavior of complex quantum systems, including high-temperature superconductors. The study's findings suggest that atoms in the clock interact like those in magnetic materials, leading to correlations and entanglement.
Researchers at NIST have successfully transferred ultraprecise time signals through open air with unprecedented precision, equivalent to the world's best atomic clocks. The demonstration uses wireless optical channels and has potential applications in geodesy, satellite navigation, and other fields.
Holger Müller's Compton clock measures time using the oscillations of a cesium atom's matter wave, which has a frequency 10 billion times higher than visible light. The clock is accurate to within 7 parts per billion and could potentially rival atomic clocks with further improvements.
Researchers found that blackbody radiation shifts caused by surrounding chamber temperature can impose limits on atomic clock precision. The study, led by Charles Clark and Marianna Safronova, explores how ytterbium atoms are affected by this faint form of influence, crucial for future clock recalibrations.
Scientists propose using ultraprecise atomic clocks to directly measure the Earth's true physical form, the geoid, which is currently determined indirectly through satellite tracking. This method has the potential to map the interior of the Earth to great depths, enabling more accurate exploration and discovery of subsurface structures.
Researchers develop new silicon resonator for ultra-stable laser, enabling narrower optical absorption lines and better optical atomic clocks. The stability of the laser is critical for these applications.
Researchers successfully sent highly accurate clock signals across hundreds of kilometers using optical fiber links, overcoming challenges to transmit stable signals over long distances. The achievement brings scientists closer to redefining the second and enabling ultra-precise navigation and other applications.
A team of researchers has demonstrated an optical frequency transfer with high stability through a standard telecommunication optical fiber network. This achievement enables the ability to compare optical clocks located far apart and transmit their stability to distant laboratories, benefiting fundamental research in physics and industry.
Scientists have created a blueprint for a nuclear clock that can be accurate to within a tenth of a second over 14 billion years. The clock uses the nucleus of a single thorium ion and has the potential to be one hundred times more accurate than current atomic clocks.
Researchers at PTB have successfully excited a quantum-mechanically strongly forbidden transition in a ytterbium ion, allowing for an optical clock with unprecedented accuracy. The resulting clock is exact to 17 digits after the decimal point, and the relative uncertainty of the Yb+ frequency was determined with 7 • 10-17.
A proposed new time-keeping system based on a neutron's orbit around an atomic nucleus could achieve unprecedented accuracy. This approach would allow scientists to test fundamental physical theories at higher precision and explore diverse applications.
To achieve accurate measurements, an ensemble of 400 atomic clocks is required. The researcher uses statistical calculations to counter challenges in distributing data without degrading clock performance. These algorithms rely on understanding past accuracy to establish reliable reference times.