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Category: quantum physics – Page 111

Groundbreaking tachyon discovery brings time travel closer to reality

A theoretical particle that travels faster than light, the tachyon has long intrigued physicists and fueled decades of speculation. Initially conceived as a possible solution to quantum and relativity paradoxes, tachyons remain purely hypothetical. Despite the lack of experimental evidence, they continue to serve as a thought-provoking concept in modern physics.

A recent study by an international team of researchers has reignited interest in tachyons, suggesting they might be possible within the framework of Einstein’s special theory of relativity. This bold claim challenges conventional understandings of causality and time, raising fundamental questions about the structure of reality. If confirmed, it could lead to a radical shift in how scientists perceive the limits of physical laws.

Physicist Gerald Feinberg introduced the idea of tachyons in 1962, proposing that such particles could always travel faster than light without ever slowing down to subluminal speeds. His argument was based on the concept of imaginary mass, a theoretical construct involving the square root of a negative number. This allowed for the mathematical possibility of faster-than-light motion without explicitly violating relativity.

Universal validity of the second law of information thermodynamics

npj Quantum Inf ormation — Universal validity of the second law of information thermodynamics is indeed universal: it must hold for any quantum feedback control and erasure protocol, regardless of the measurement process involved, as long as the protocol is overall compatible with thermodynamics. Our comprehensive analysis not only encompasses new scenarios but also retrieves previous ones, doing so with fewer assumptions. This simplification contributes to a clearer understanding of the theory.

Using quantum mechanics to transmit information more securely

In the realm of quantum information distribution, sending a signal from point A to point B is like a baseball pitcher relaying a secret pitch call to the catcher. The pitcher has to disguise the signal from the opposing team and coaches, base runners, and even onlookers in the stands so no one else cracks the code.

The catcher can’t just stay in one spot or rely on the same finger pattern every time, because savvy opponents are constantly working to decipher any predictable sequence. If the signs are intercepted or misread, the batter gains an advantage, and the entire inning can unravel for the pitcher.

But what if there was a way for pitchers to bolster their signals by adding extra layers of “dimensionality” to each call, effectively increasing the chances of delivering it correctly to the catcher no matter how many eyes are watching? What if by incorporating more nuanced gestures—a subtle shift in glove position, a specific tap on the mound—the pitcher could craftily conceal their intentions?

Theoretical analysis broadens the search for topological superconductivity

Exotic superconducting states could exist in a wider range of materials than previously thought, according to a theoretical study by two RIKEN researchers published in Physical Review B.

Superconductors conduct electricity without any resistance when cooled below a that is specific to the . They are broadly classified into two types: conventional superconductors whose superconducting mechanism is well understood, and whose mechanism has yet to be fully determined.

Superconductors have intrigued scientists since their first experimental demonstration at the beginning of the 20th century. This is not just because they have numerous applications, including great promise for , but also because superconductors host a rich range of fundamental physics that has allowed physicists to gain a deeper understanding of material science.

Entangling two physically separate resonators enables a major advance in the science of quantum sound

Entanglement—linking distant particles or groups of particles so that one cannot be described without the other—is at the core of the quantum revolution changing the face of modern technology.

While entanglement has been demonstrated in very small particles, new research from the lab of University of Chicago Pritzker School of Molecular Engineering (UChicago PME) Prof. Andrew Cleland is thinking big, demonstrating high-fidelity entanglement between two acoustic wave resonators.

The paper is published in Nature Communications.

Excitons in organic semiconductors: Unraveling their quantum entanglement and dynamics

Excitons, encountered in technologies like solar cells and TVs, are quasiparticles formed by an electron and a positively charged “hole,” moving together in a semiconductor. Created when an electron is excited to a higher energy state, excitons transfer energy without carrying a net charge. While their behavior in traditional semiconductors is well understood, excitons act differently in organic semiconductors.

Recent research led by condensed matter physicist Ivan Biaggio focuses on understanding the mechanisms behind dynamics, quantum entanglement, and dissociation in organic molecular crystals.

The paper is published in the journal Physical Review Letters.

World’s first quantum large language model can shape future of AI

Risk assessment and fraud detection can be enhanced with its usage in the financial sector.

A UK-based firm has launched the world’s first quantum large language model (QLLM). Developed by SECQAI, the QLLM is claimed to be capable of shaping the future of AI.

The company integrated quantum computing into traditional AI models to improve efficiency and problem-solving.

According to a report, the development involved creating an in-house quantum simulator with gradient-based learning and a quantum attention mechanism.