All articles tagged with #quantum mechanics
The piece argues that the 'reality' of a multiverse hinges on definition: while quantum mechanics’ many-worlds view and string theory’s landscape offer frameworks in which multiple universes could exist, there is no direct evidence for other universes. Indirect hints might come from how these theories predict physics at tiny scales or high-energy experiments, but proving a multiverse remains elusive.
A Vienna team extends Bell-test ideas to indefinite causal order, using entangled photons arranged so that the sequence A→B or B→A depends on polarization. The observed correlations differ from local-hidden-variable predictions by 18 standard deviations, suggesting quantum processes can exist in a superposition of temporal orders. However, notable loopholes remain (photon loss, limited separation) and further experiments are needed to close them, though the work points toward broader applications of time-uncertain quantum processes.
Physicists reveal a measurement-based feedback protocol that can steer a monitored quantum system’s evolution to mimic reversed time, effectively reshaping the arrow of time and enabling potential energy extraction in quantum devices; while not time travel, the approach could boost quantum batteries and algorithms, with plans to test on superconducting qubits.
An interview about Paul Davies’s book Quantum 2.0 explains how the original quantum mechanics (Quantum 1.0) gave us technologies like lasers, chips, and MRI, and how Quantum 2.0 involves manipulating individual quanta to encode information in the particles themselves, signaling a new tech revolution. The discussion spans quantum biology, the rise of quantum AI, and the tantalizing prospect of mind–machine interfaces, while noting ongoing debates about how quantum reality relates to everyday experience and imagining a potential Quantum 3.0 ahead.
A Wellesley College study found rats given a microtubule-stabilizing treatment stayed conscious longer under anesthesia, lending experimental support to Orch OR—the idea that consciousness arises from quantum processes in the brain—and suggesting quantum effects might persist at physiological temperatures; although controversial, the result fuels the debate on whether consciousness could extend beyond the brain, if validated.
Even a truly empty box still contains zero-point energy—the ground-state energy of quantum fields and particles—so the vacuum is energy-filled and can influence reality (as seen in effects like Casimir). Depending on interpretation, these fluctuations may appear as motion or be purely nonclassical, but the takeaway is that the vacuum is ‘nothing infused with the potential to be anything.’
The article argues that the Pusey-Barrett-Rudolph (PBR) theorem, proven in 2012, shows the quantum state must be ontic (a property of reality) under three basic assumptions, ruling out epistemic hidden-variable interpretations and implying the wavefunction has real physical status. This places quantum foundations on firmer ground, clarifies debates about reality vs. knowledge in quantum mechanics, and underscores the theorem’s impact alongside ongoing quantum technologies that exploit entanglement and nonlocality.
Physicists in Vienna demonstrated the largest quantum superposition yet by placing clusters of about 7,000 sodium atoms (≈8 nm across) into spatially distinct paths that interfere, showing that sizeable objects can exhibit wave-like behavior and informing the quantum‑classical boundary for future quantum technologies.
Scientists at Stevens Institute of Technology and Yale University are launching the world’s first experiment to detect gravitons, using a centimeter-scale resonator filled with superfluid helium cooled to its quantum ground state. A passing gravitational wave should impart energy that becomes a single graviton, converted into a phonon and read out with precision lasers. By scaling the detector from gram-scale to larger detectors, the team hopes to observe gravitons directly and bridge General Relativity with Quantum Mechanics, backed by the Keck Foundation.
A theoretical study suggests Cherenkov radiation in empty space could arise from a negative-energy ghost instability, uniting two seemingly different phenomena and offering a potential window into modified gravity; if true, the vacuum would have structure and stored energy, but the idea remains purely theoretical with no practical detection method yet.
Physicists have found a way to harness superradiance, a quantum phenomenon that usually causes instability, to generate powerful, long-lasting microwave signals, opening new possibilities for advancements in medicine, navigation, and quantum communication.
Some physicists propose that our universe might exist inside a black hole of a larger cosmos, based on theories linking black hole information paradoxes, holography, and cosmic geometry, suggesting a universe within a universe concept that challenges traditional views of space and time.
A new study challenges the long-held belief that light behaves as both a wave and a particle, proposing that interference patterns can be explained solely through quantum particles and dark photon states, potentially reshaping fundamental physics concepts.
Stranger Things features a fictional parallel universe called the Upside Down, which is inspired by real scientific theories like the many-worlds interpretation of quantum mechanics, a controversial but popular idea suggesting the existence of multiple, non-interacting universes.
Scientists in New York City have successfully observed time reflections, a phenomenon where electromagnetic waves are reversed in time, using engineered metamaterials and electronic switches, opening new possibilities for wireless communication and wave-based computing.