Articles tagged with Photons
The NIST device can accurately count 1, 2 or 3 photons at least 83 percent of the time, a capability essential for advanced precision optical metrology. The detector has an internal quantum efficiency of 68 ± 18 percent and potential to operate at higher temperatures than other single-photon detectors.
The maximum transmission rate of quantum-encrypted messages is limited by detector dead times, which can compromise security. Researchers aim to reduce these times to increase speeds and enhance wireless cryptography.
Researchers at Yale have made two major breakthroughs in advancing quantum computing, enabling the transfer of information between distant qubits and paving the way for more complex quantum computers. By developing a superconducting communication 'bus,' they can now store and transfer information efficiently between qubits on a chip.
Researchers at the University of Michigan have successfully established entanglement between two atoms, a key feature of quantum communication. This achievement has significant implications for the development of super-fast quantum computers and a quantum internet.
Scientists have created a new theory on how to create transistors for quantum computers using photons. The transistors can process optical signals and enable the development of supercomputers that can solve extremely complicated tasks.
Astronomers found a gigantic hole in the Universe, spanning nearly a billion light-years, empty of stars, galaxies, gas, and dark matter. The void's existence was confirmed by studying data from the NRAO VLA Sky Survey, which revealed a significant drop in galaxy count in a region southwest of Orion.
Researchers at Weizmann Institute of Science observe oscillating interference pattern between two identical quantum particles, proving quantum theory's predictions. The particles' actions are inextricably tied due to entanglement, even when separated by distance.
Researchers at NIST have built a prototype high-speed quantum key distribution (QKD) system that can transmit secure keys in real-time over distances of at least 10 kilometers. The system achieves dramatically lower noise levels than similar systems, enabling theoretically unbreakable encryption and decryption.
Researchers used nanotechnology to study exciton mobility on carbon nanotubes, revealing that each excition travels about 90 nanometers and visits some 10,000 carbon atoms during its lifespan. The unique properties of carbon nanotubes made them an ideal system for observing single-molecule reactions.
Researchers from NIST, NTT Corp., and Stanford University have set a record for sending 'quantum keys' over a 200-kilometer fiber-optic link. The experiment demonstrated the feasibility of practical inter-city terrestrial quantum communications networks and long-range wireless systems using communication satellites.
Researchers at UCR have successfully demonstrated the remote operation of micromachines using light to change the Casimir force. The study uses silicon plates with varying carrier densities and training a beam of light on them to alter the plate's properties.
Andrzej Joachimiak and Gerold Rosenbaum receive the award for their key contributions to protein crystallography research at Argonne National Laboratory. The recognition highlights the quality of their work in structural genomics and biophysics.
A paper by Lawrence Krauss and Robert Scherrer suggests that matter will dominate over radiation in an ever-expanding universe dominated by dark energy. This means that ordinary matter particles, such as protons and neutrons, will remain stable for trillions of years, potentially allowing life to endure forever.
Physicists at NIST have devised a system to generate paired photons with great efficiency over a wide range of energy, reducing noise from extraneous photons. The new microstructured optical fiber increases light intensity, making pair production more likely.
Researchers have developed unique three-dimensional solar cells that capture nearly all of the light that strikes them, increasing efficiency and reducing size, weight and mechanical complexity. The new cells could also enable improvements in photovoltaic coating materials and change the way solar cells are designed.
A team of physicists proposes a new mechanism to produce cosmic gamma rays from starlight, challenging existing theories. The new mechanism involves the interaction of fast-moving nuclei with ultraviolet light, producing cosmic gamma rays without requiring extreme electromagnetic fields.
Researchers have developed a system that uses a single trapped atom to generate high-quality single photons, which can be controlled and made indistinguishable for quantum computing. The 'single-photon server' has the potential to revolutionize quantum information processing by enabling deterministic atom-photon entanglement experiments.
Using artificial atoms on a chip, Yale physicists have successfully detected and stored individual microwave photons, bringing quantum mechanics to a larger scale. This breakthrough enables the creation of new types of quantum machines that can exponentially speed up computations in cryptography, quantum physics, and chemistry.
A team of scientists has successfully observed rare particles of light emitted during the radioactive decay of a neutron, confirming theoretical predictions. The experiment, conducted at NIST's Center for Neutron Research, used novel instruments and techniques to minimize uncertainties and detect elusive photons.
Researchers have developed a novel simulator that can recreate quantum behavior in atoms and particles, enabling control over individual parts of a quantum system. This breakthrough is crucial for developing powerful quantum computers that can perform calculations billions of times faster than normal computers.
Researchers at NIST successfully transferred orbital angular momentum from light to sodium atoms, demonstrating control over the state of an atom. This breakthrough enables manipulation of Bose-Einstein condensates and potentially quantum information systems.
Researchers at NIST have successfully purified entangled atom pairs using a nondestructive method, which could improve the quality of particles for practical applications in quantum computing and communications. The purification rate is significantly higher than previous experiments with photons.
Arizona State University has received a $1.1 million grant from the National Science Foundation to develop innovative nanotechnology solutions for solar energy. The team aims to create tiny devices that can harness light energy more efficiently and convert it into electricity.
Researchers develop innovative process to combine low-energy photons in sunlight into higher-energy shortwave photons, boosting solar cells' efficiency. This breakthrough could enable the use of previously lost light energy, leading to a significant increase in solar cell efficiency.
Researchers at USC Viterbi School of Engineering have developed a method to use entangled photons as part of the message stream, allowing for the use of highly efficient turbo codes. This breakthrough enables quantum computing systems to operate close to theoretical limits of efficiency.
Researchers at EPFL create polariton Bose-Einstein condensate in solid state, exhibiting macroscopic order and long-range coherence. This breakthrough could lead to new technologies like quantum computing and advanced electronics.
Scientists from LANL, NIST and Albion College generated and transmitted secret quantum keys over 184.6 km of fiber-optic cable, setting a new record distance for quantum key distribution. The team used innovative sensors to detect single photons, improving the security of quantum encryption and paving the way for practical applications.
Kurt Gibble's paper analyzes the speed of an atom after absorbing a photon of light and shows that photons in narrow laser beams deliver less momentum than those in wide beams. This discovery has implications for atomic clocks, which use microwaves to achieve high accuracy, potentially allowing them to be even more precise.
A new model mimics bidding behavior on eBay, showing that late bids are more likely to win than early incremental bids. Researchers also break quantum physics barrier by demonstrating interference among independent photons, vital for future quantum computers and secure communication schemes.
A new time-of-flight PET scanner with LYSO detector crystals improves diagnostic accuracy and reduces variability in patient images. This technology enables more accurate detection of small lesions and better lesion characterization, leading to improved cancer diagnosis and treatment.
The NIST quantum key distribution system has achieved a record speed of 4 million bits per second (bps) over 1 kilometer of optical fiber, twice the previous record. The system uses single photons and operates at an error rate of only 3.6 percent, enabling highly secure key exchange.
Scientists at the University of Illinois have discovered significant structure in the current-voltage characteristics of a transistor laser, allowing them to study the elusive electronic structure. The research enables the development of transistor lasers that can operate at different speeds for various commercial applications.
Researchers demonstrate counterfactual computation, inferring information about an answer even when the quantum computer doesn't run. This technique, called interaction-free measurement, uses wave-particle duality to search a region of space without entering it.
The new superconducting transition-edge sensors (TES) enhance quantum key distribution by detecting single photons with higher efficiency and lower dark count rates than traditional avalanche photodiodes. This allows for increased distances for secure data transmission over optical fibers.
Researchers develop complete quantum mechanical solution for system with four charged particles, simulating double photoionization of H2. The study explores electron correlations and their effects on ejection patterns, resolving debates between kinematic and correlation-based explanations.
Researchers at Georgia Institute of Technology have successfully stored and retrieved single photons between remote quantum memories composed of rubidium atoms. This breakthrough demonstrates the storage of light-based information in matter, a necessary step for transmitting quantum information long distances through optical fibers.
Researchers at the Max Planck Institute have cooled single rubidium atoms in an optical resonator for up to 17 seconds, a record-breaking achievement. This milestone demonstrates the potential of atomic manipulation for quantum computing applications.
Researchers at USC and UTexas will build a detector for single photon computers, which could perform certain tasks far faster than traditional chips. The project aims to create ultra-small devices that generate single photons, one at a time, using 'quantum dots' and nanoscale technology.
Researchers successfully entangled a photon and a single atom located in an atomic cloud, demonstrating the first time this has passed the rigorous test of Bell inequality violation. The findings are a significant step towards developing secure long-distance quantum communications.
A new technique manipulates laser light to create decoy signals, distracting eavesdroppers and protecting secret messages. This development has immediate commercial applications, improving the security of fibre-optic communications.
Researchers from Pitt and Bell Labs have successfully created a two-dimensional semiconductor structure that allows excitons to exist longer and travel farther than previously recorded. This breakthrough could lead to the development of excitonic circuits for optical communication, enabling photons to be converted directly into excitons.
Physicists at NIST have demonstrated single photon detectors with an 88% efficiency, a significant improvement over previous designs. The detectors use a tungsten film chilled to near-absolute zero and are expected to enable reliable quantum communications systems.
Scientists at Max Planck Institute of Quantum Optics create single photons by trapping a calcium ion between two mirrors, allowing for controlled emission. The device enables user-controlled photon emission time and shape, paving the way for quantum information processing.
A team of physicists at Georgia Institute of Technology has successfully transferred quantum information from two different groups of atoms onto a single photon. The researchers report using atomic clouds of rubidium atoms as a matter qubit and converting the entanglement into a single photon.
The team created two prototype fibers with new technology, combining optical and electronic components, enabling smart fabrics and potential computer interface innovations. Assembling the fibers into woven structures allows for precise identification of light sources on surfaces.
Researchers at Yale University have successfully created an artificial molecule on a chip, shrinking experimental apparatus to a tiny size. The achievement improves coupling between resonator and atom by a factor of 1000, paving the way for exploring fundamental interactions of light and matter.
Researchers at Yale University have developed a miniaturized superconducting cavity that enables quantum optics experiments on a microchip. The system allows for rapid exchange of energy between photons and atoms, demonstrating the potential for faster computing with quantum qubits.
Professor Jim Hough of the University of Glasgow believes that gravitational waves will be detected in the near future due to advancements in instrument technology. The UK's GEO 600 device has shown promising results, and its innovations are being considered by LIGO for implementation.
A team of scientists at PNNL has observed real-time interactions between single proteins, supporting the 'fly-fishing mechanism' theory. The technique used, single-molecule photon stamping spectroscopy, allows for dynamic measurements of protein dynamics.
Researchers have developed a technique to improve electromagnetic signal transmission in complex environments using time reversal, which may enhance cell phone communications. Additionally, studying competition dynamics in noisy systems reveals that flexible competitors can increase their prosperity by adjusting their adaptation rate. ...
Researchers at the University of Toronto have successfully created a three-photon entangled state, enabling precise measurements that surpass those made by single photons. The breakthrough has the potential to revolutionize fields like quantum computing and gravitational wave detection.
The NIST quantum key distribution system generates a verifiably secret key at a rate of 1 million bits per second, about 100 times faster than previously reported systems. The system uses time-stamping and high-speed observations to identify photons from the sender among multiple photons from other sources.
A NIST scientist has demonstrated efficient production of single photons at the highest temperatures reported for a photon source. The advance is a step toward practical, ultrasecure quantum communications and useful for certain types of metrology.
Researchers have successfully created carbon nanotubes with ideal photon emission, a narrow and steady emission that can be used for quantum cryptography and single-molecule sensors. This breakthrough enables the development of practical applications in fields such as quantum optics and biology.
The NIST-developed device detects single photons with negligible dark counts using a tungsten film coupled to fiber optic communication line. It achieves a detection rate of 20,000 photons per second with an efficiency of 20%, aiming for over 80% improvement.
Researchers used ultrafast light pulses to visualize the speed distribution of electrons in Rydberg atoms, revealing their wave-like behavior. This study provides new insights into the interaction between light and slow-moving electrons.
A new SPECT collimator pair increases sensitivity, particularly in central brain structures, while maintaining spatial resolution. The best combination of fan-beam and cone-beam collimation has been found to greatly improve dual-head SPECT images.
The award recognizes the researchers' contributions to developing a viable alternative to neutrons for studying magnetic structure in rare earths and actinides. Resonant magnetic x-ray scattering complements neutron magnetic scattering, opening new possibilities for research in condensed matter physics.
Researchers found a correlation between fluence and duration for both short and long bursts, but the degree of this relationship is statistically different at a 4.5 sigma significance level. This suggests that short bursts may originate from fundamentally different physical processes than long bursts.
Vision researchers found that rhodopsin molecules pair up in neat double rows on the outer-segment disc membranes of rods. This arrangement allows for efficient absorption of dim light and amplification of faint signals, enabling the brain to detect individual photons.