A breakthrough that builds on the effects observed in the famous “double slit” experiment could allow physicists a greater ability to observe quantum effects within gravitational fields, according to new research published online.
A team of Italian scientists says they have successfully conducted neutron interferometry using more than one silicon crystal in a physics first that once seemed impossible, based on past attempts.
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This could be the road to quantum computation.
“In contrast, solid-state emitters embedded in a photonic circuit are hardly ‘the same’ due to slightly different surroundings influencing each emitter. It is much harder for many solid-state emitters to build up phase coherence and collectively interact with photons like cold atoms. We could use cold atoms trapped on the circuit to study new collective effects,” Hung continues.
The platform demonstrated in this research could provide a photonic link for future distributed quantum computing based on neutral atoms. It could also serve as a new experimental platform for studying collective light-matter interactions and for synthesizing quantum degenerate trapped gases or ultracold molecules.
“Unlike electronic transistors used in daily life, our atom-coupled integrated photonic circuit obeys the principles of quantum superposition,” explains Hung. “This allows us to manipulate and store quantum information in trapped atoms, which are quantum bits known as qubits. Our circuit may also efficiently transfer stored quantum information into photons that could ‘fly’ through the photonic wire and a fiber network to communicate with other atom-coupled integrated circuits or atom-photon interfaces. Our research demonstrates a potential to build a quantum network based on cold-atom integrated nanophotonic circuits.”
A study focused on cesium vanadium antimonide, a Kagome metal, has shown its potential in enhancing nano-optics by generating unique plasmon polaritons. These findings could advance optical communication and sensing technologies.
In traditional Japanese basket-weaving, the ancient “Kagome” design, notable for its symmetrical arrangement of interlaced triangles with shared corners, graces many handcrafted items. Similarly, in quantum physics, scientists use the term “Kagome” to refer to a category of materials whose atomic structures mimic this unique lattice pattern.
Since 2019, when the latest family of Kagome metals was discovered, physicists have been working to better understand their properties and potential applications. A new study led by Florida State University (FSU) Assistant Professor of Physics Guangxin Ni focuses on how a particular Kagome metal interacts with light to generate what are known as plasmon polaritons — nanoscale-level linked waves of electrons and electromagnetic fields in a material, typically caused by light or other electromagnetic waves. The work was published recently in the journal Nature Communications.
Why does the universe contain matter and (virtually) no antimatter? The BASE international research collaboration at the European Organization for Nuclear Research (CERN) in Geneva, headed by Professor Dr. Stefan Ulmer from Heinrich Heine University Düsseldorf (HHU), has achieved an experimental breakthrough in this context.
Scientists cannot observe dark matter directly, so to “see” it, they look for signals that it has interacted with other matter by creating a visible photon. However, signals from dark matter are incredibly weak. If scientists can make a particle detector more receptive to these signals, they can increase the likelihood of discovery and decrease the time to get there. One way to do this is to stimulate the emission of photons.
Quantum technology is quantifiable in qubits, which are the most basic unit of data in quantum computers. The operation of qubits is affected by the quantum coherence time required to maintain a quantum wave state.
Research on quantum internet technology highlights the challenge of producing stable photons at telecom wavelengths, with recent studies focusing on material improvements and advanced emission techniques to enhance quantum network efficiency.
Computers benefit greatly from being connected to the internet, so we might ask: What good is a quantum computer without a quantum internet?
The secret to our modern internet is the ability for data to remain intact while traveling over long distances, and the best way to achieve that is by using photons. Photons are single units (“quanta”) of light. Unlike other quantum particles, photons interact very weakly with their environment. That stability also makes them extremely appealing for carrying quantum information over long distances, a process that requires maintaining a delicate state of entanglement for an extended period of time. Such photons can be generated in a variety of ways. One possible method involves using atomic-scale imperfections (quantum defects) in crystals to generate single photons in a well-defined quantum state.
Mining cryptocurrencies like bitcoin could be done using quantum computers, cutting their electricity use by 90 per cent.
By Alex Wilkins
Calculations show that nerve fibres in the brain could emit pairs of entangled particles, and this quantum phenomenon might explain how different parts of the brain work together.
