Theorists proposed an idea they called quantum teleportation—a means of transferring the identity of one particle to another over some distance.
Category: quantum physics – Page 23
The ultrafast dynamics and interactions of electrons in molecules and solids have long remained hidden from direct observation. For some time now, it has been possible to study these quantum-physical processes—for example, during chemical reactions, the conversion of sunlight into electricity in solar cells and elementary processes in quantum computers—in real time with a temporal resolution of a few femtoseconds (quadrillionths of a second) using two-dimensional electronic spectroscopy (2DES).
However, this technique is highly complex. Consequently, it has only been employed by a handful of research groups worldwide to date. Now a German-Italian team led by Prof. Dr. Christoph Lienau from the University of Oldenburg has discovered a way to significantly simplify the experimental implementation of this procedure. “We hope that 2DES will go from being a methodology for experts to a tool that can be widely used,” explains Lienau.
Two doctoral students from Lienau’s Ultrafast Nano-Optics research group, Daniel Timmer and Daniel Lünemann, played a key role in the discovery of the new method. The team has now published a paper in Optica describing the procedure.
Topological insulator nanowires reveal superconducting effect, bringing topological quantum computing closer to reality
Posted in computing, nanotechnology, quantum physics | Leave a Comment on Topological insulator nanowires reveal superconducting effect, bringing topological quantum computing closer to reality
Physicists at the University of Cologne have taken an important step forward in the pursuit of topological quantum computing by demonstrating the first-ever observation of Crossed Andreev Reflection (CAR) in topological insulator (TI) nanowires.
This finding, published under the title “Long-range crossed Andreev reflection in topological insulator nanowires proximitized by a superconductor” in Nature Physics, deepens our understanding of superconducting effects in these materials, which is essential for realizing robust quantum bits (qubits) based on Majorana zero-modes in the TI platform—a major goal of the Cluster of Excellence Matter and Light for Quantum Computing (ML4Q).
Quantum computing promises to revolutionize information processing, but current qubit technologies struggle with maintaining stability and error correction. One of the most promising approaches to overcoming these limitations is the use of topological superconductors, which can host special quantum states called Majorana zero-modes.
Once described by Einstein as “spooky action at a distance,” quantum entanglement may now seem less intimidating in light of new research findings.
Osaka Metropolitan University physicists have developed new, simpler formulas to quantify quantum entanglement in strongly correlated electron systems and applied them to study several nanoscale materials. Their results offer fresh perspectives into quantum behaviors in materials with different physical characteristics, contributing to advances in quantum technologies.
The study is published in Physical Review B.
Predictions of theories that combine quantum mechanics with gravity could be observed using highly sensitive photon detection in a tabletop experiment.
Quantum-gravity theories attempt to unite gravity and quantum mechanics. A proposed tabletop experiment called Gravity from the Quantum Entanglement of Space Time (GQuEST) would search for a predicted effect of such theories using a new type of interferometer—one that counts photons rather than measuring interference patterns. The GQuEST team has now calculated the sensitivity of their design and shown that it can recover the predicted signal 100 times faster than traditional interferometer setups [1].
Quantizing gravity implies that spacetime is not continuous—it becomes “pixelated” when you look at scales as small as 10−35 m, far too small to be probed in any experiment. However, certain quantum-gravity models predict that spacetime can fluctuate—a kind of spontaneous stretching and squeezing in the spacetime fabric that might produce observable effects [2]. “You couldn’t detect a single pixel, but you could detect the coherent fluctuations of many pixels,” says Caltech theorist Kathryn Zurek. She has formulated a “pixellon” model, which predicts that collective fluctuations inside an interferometer can cause a detectable frequency change, or modulation, in the interferometer’s output light [3].
If gravity arises from entropy, scientists could unite Einstein’s general relativity with the quantum realm while shedding light on dark matter and dark energy.
China’s Zuchongzhi-3 ignites a fierce quantum race with Google’s Willow, pushing quantum singularity from theory toward reality faster than skeptics predicted.
This work presents a formal theory of consciousness, showing how quantum mechanics emerges from singularity, multiplicity, and trinity.
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Part 3 of the groundbreaking but less-known theory of quantum mechanics proposed by Louis de Broglie in 1923. In this video de Broglie’s unification of wave and particles using his matter waves to show that Fermat’s principle of ray optics is equivalent to Maupertuis’ principle for the dynamics of particles. Although incomplete, this corresponds to the early development of de Broglie’s pilot-wave theory.
∘ Pilot-wave theory (part 1): the origin of de Broglie’s matter waves https://youtu.be/YQNEziGyDxU
∘ Pilot-wave theory (part 2): explaining Bohr’s atom https://youtu.be/5MMs6iFSiY8
∘ This is how the wave-particle duality of light was discovered https://youtu.be/f7JvywBOGYY
∘ Playlist Quantum Physics https://www.youtube.com/playlist?list=PL_UV-wQj1lvVxch-RPQIUOHX88eeNGzVH
∘ L. de Broglie, “Ondes et quanta,” Comptes Rendus Hebdomadaires des Séances de l’Aadémie des Sciences (Paris), 177,507 (1923)
∘ L. de Broglie, “Quanta de lumière, diffraction et interférences,” Comptes Rendus Hebdomadaires des Séances de l’Aadémie des Sciences (Paris), 177,548 (1923)
∘ L. de Broglie, “Les quanta, la théorie cinétique des gaz et le principe de Fermat,” Comptes Rendus Hebdomadaires des Séances de l’Aadémie des Sciences (Paris), 177,630 (1923)
∘ F. Grimaldi, “Physico-mathesis de lumine, coloribus et iride aliisque adnexis” (1665)
∘ I. Newton, “Optiks” (1704)
∘ L. de Broglie, “On the Theory of Quanta,” translation of doctoral thesis, Foundation Louis De Broglie (1924)
∘ A. Einstein, “Quantum theory of the monatomic ideal gas, Part II” Sitzungsber. Preuss. Akad. Wiss. 3, (1925)
M. de Broglie, public domain.
Diffraction half plane with rays, by MikeRun under CC BY-SA 4.0
Oualidia Lagoon, Morocco via Google Earth.
Matter Waves, AT&T Archives and History Center (1961)
Francesco Grimaldi, public domain.
First edition of Opticks, public domain.
Isaac Newton by Sir Godfrey Kneller, public domain.
Light refraction, by ajizai, public domain.
Interference pattern, by J.S. Diaz (own work)
Polarization clamp, by A.Davidhazy under CC BY-SA 4.0
Light bulb through diffraction grating, by R.D. Anderson under CC BY-SA 3.0
Davisson and Germer, public domain.
Davisson-Germer Figure 2, public domain.
Fifth Solvay Conference, AIP
Refraction with soda straw, by Bcrowell under CC BY-SA 1.0
Pierre Louis Moreau de Maupertuis, public domain.
P. Langevin, public domain.
Peter Debye, AIP
Portrait of Erwin Schrodinger, AIP
Eels Swimming in Aquarium by M. Ehlers, free use via Pexels https://www.pexels.com/video/eels-swimming-in-aquarium-10106765/
AIP: American Institute of Physics, Emilio Segrè Visual Archives.
CC BY-SA 1.0: https://creativecommons.org/licenses/by-sa/1.0/deed.en.
CC BY-SA 3.0 Deed: https://creativecommons.org/licenses/by-sa/3.0/deed.en.
CC BY-SA 4.0 Deed: https://creativecommons.org/licenses/by-sa/4.0/deed.en.
CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/deed.en
Real-space quantum vortices are key to many phenomena in modern physics. New experiments provide the first proof of vortices in momentum space, raising the prospect of exploring novel orbitronic phenomena.