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Category: quantum physics – Page 23

Is Gravity Just an Illusion Caused by Entropy? New Theory Explains How

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Over the past few decades, the idea that gravity is not a fundamental interaction but is instead caused by the increase of entropy has become increasingly popular in the world of physics. Today, we have a paper from a group of physicists who claim that entropic gravity might be the result of space being full of qubits. Let’s take a look.

Paper: https://journals.aps.org/prx/abstract… Check out my new quiz app ➜ http://quizwithit.com/ 📚 Buy my book ➜ https://amzn.to/3HSAWJW 💌 Support me on Donorbox ➜ https://donorbox.org/swtg 📝 Transcripts and written news on Substack ➜ https://sciencewtg.substack.com/ 👉 Transcript with links to references on Patreon ➜ / sabine 📩 Free weekly science newsletter ➜ https://sabinehossenfelder.com/newsle… 👂 Audio only podcast ➜ https://open.spotify.com/show/0MkNfXl… 🔗 Join this channel to get access to perks ➜ / @sabinehossenfelder #science #sciencenews #physics #gravity.

🤓 Check out my new quiz app ➜ http://quizwithit.com/
📚 Buy my book ➜ https://amzn.to/3HSAWJW
💌 Support me on Donorbox ➜ https://donorbox.org/swtg.
📝 Transcripts and written news on Substack ➜ https://sciencewtg.substack.com/
👉 Transcript with links to references on Patreon ➜ / sabine.
📩 Free weekly science newsletter ➜ https://sabinehossenfelder.com/newsle…
👂 Audio only podcast ➜ https://open.spotify.com/show/0MkNfXl…
🔗 Join this channel to get access to perks ➜
/ @sabinehossenfelder.

#science #sciencenews #physics #gravity

Cambridge Scientists Unlock Century-Old Quantum Secret That Could Revolutionize Solar Power

Cambridge scientists have uncovered a hidden quantum mechanism in an organic semiconductor that could revolutionize solar energy. In a finding that connects modern research with ideas from a century ago, scientists have identified in an organic semiconductor a behavior that was long believed to o

Surpassing Thermodynamic Limits: Quantum Energy Harvesters Exceed Carnot Efficiency

Researchers have discovered a method to surpass traditional thermodynamic limits in converting waste heat into electricity. Japanese researchers have discovered a way to overcome long-standing thermodynamic limits, such as the Carnot efficiency, by using quantum states that do not undergo thermal

Nobel Prize: Quantum Tunneling on a Large Scale

The 2025 Nobel Prize in Physics recognizes the discovery of macroscopic quantum tunneling in electrical circuits.

This story will be updated with a longer explanation of the Nobel-winning work on Thursday, 9 October.

Running up against a barrier, a classical object bounces back, but a quantum particle can come out the other side. So-called quantum tunneling explains a host of phenomena, from electron jumps in semiconductors to radioactive decays in nuclei. But tunneling is not limited to subatomic particles, as underscored by this year’s Nobel Prize in Physics. The prize recipients—John Clarke from the University of California, Berkeley; Michel Devoret from Yale University; and John Martinis from the University of California, Santa Barbara—demonstrated that large objects consisting of billions of particles can also tunnel across barriers [1– 3]. Using a superconducting circuit, the physicists showed that the superconducting electrons, acting as a collective unit, tunneled across an energy barrier between two voltage states. The work thrust open the field of superconducting circuits, which have become one of the promising platforms for future quantum computing devices.

Observing quantum weirdness in our world: Nobel physics explained

The Nobel Prize in Physics was awarded to three scientists on Tuesday for discovering that a bizarre barrier-defying phenomenon in the quantum realm could be observed on an electrical circuit in our classical world.

The discovery, which involved an effect called , laid the foundations for technology now being used by Google and IBM aiming to build the quantum computers of the future.

Here is what you need to know about the Nobel-winning work by John Clarke of the UK, Frenchman Michel Devoret and American John Martinis.

Quantum Tunneling Experiments Earn Team The Nobel Prize in Physics

Briton John Clarke, Frenchman Michel Devoret and American John Martinis won the Nobel Prize in Physics on Tuesday for putting quantum mechanics into action and enabling the development of all kinds of digital technology from cellphones to a new generation of computers.

The Nobel jury noted that their work had “provided opportunities for developing the next generation of quantum technology, including quantum cryptography, quantum computers and quantum sensors”

Quantum mechanics describes how differently things work on incredibly small scales.

Physicists develop new quantum sensor at the atomic lattice scale

From computer chips to quantum dots—technological platforms were only made possible thanks to a detailed understanding of the used solid-state materials, such as silicon or more complex semiconductor materials. This understanding also includes being able to identify and control irregularities in the crystal lattice of such materials.

If, for example, an atom is missing in the lattice structure of the crystals, a and thus an can become trapped there. Such charge traps generate electromagnetic noise that limits the functionality of these materials. However, it is extremely difficult to locate these charge traps on an atomic scale.

Researchers from the “Integrated Quantum Photonics” group at the Department of Physics at Humboldt-Universität zu Berlin (HU) and the “Joint Lab Diamond Nanophotonics” at the Ferdinand-Braun-Institut, led by Prof. Dr. Tim Schröder, have developed a new sensor that can detect such individual electrical charges more precisely than ever before.

2025 Nobel Prize in Physics Peer Review

Introduction.

Grounded in the scientific method, it critically examines the work’s methodology, empirical validity, broader implications, and opportunities for advancement, aiming to foster deeper understanding and iterative progress in quantum technologies. ## Executive Summary.

This work, based on experiments conducted in 1984–1985, addresses a fundamental question in quantum physics: the scale at which quantum effects persist in macroscopic systems.

By engineering a Josephson junction-based circuit where billions of Cooper pairs behave collectively as a single quantum entity, the laureates provided empirical evidence that quantum phenomena like tunneling through energy barriers and discrete energy levels can manifest in human-scale devices.

This breakthrough bridges microscopic quantum mechanics with macroscopic engineering, laying foundational groundwork for advancements in quantum technologies such as quantum computing, cryptography, and sensors.

Overall strengths include rigorous experimental validation and profound implications for quantum information science, though gaps exist in scalability to room-temperature applications and full mitigation of environmental decoherence.

Framed within the broader context, this award highlights the enduring evolution of quantum mechanics from theoretical curiosity to practical innovation, building on prior Nobel-recognized discoveries like the Josephson effect (1973) and superconductivity mechanisms (1972).

Continue reading “2025 Nobel Prize in Physics Peer Review” | >

Nobel Prize in Physics 2025

A major question in physics is the maximum size of a system that can demonstrate quantum mechanical effects. This year’s Nobel Prize laureates conducted experiments with an electrical circuit in which they demonstrated both quantum mechanical tunnelling and quantised energy levels in a system big enough to be held in the hand.

Quantum mechanics allows a particle to move straight through a barrier, using a process called tunnelling. As soon as large numbers of particles are involved, quantum mechanical effects usually become insignificant. The laureates’ experiments demonstrated that quantum mechanical properties can be made concrete on a macroscopic scale.

In 1984 and 1985, John Clarke, Michel H. Devoret and John M. Martinis conducted a series of experiments with an electronic circuit built of superconductors, components that can conduct a current with no electrical resistance. In the circuit, the superconducting components were separated by a thin layer of non-conductive material, a setup known as a Josephson junction. By refining and measuring all the various properties of their circuit, they were able to control and explore the phenomena that arose when they passed a current through it. Together, the charged particles moving through the superconductor comprised a system that behaved as if they were a single particle that filled the entire circuit.

Rethinking Our Place in the Universe

The new map of the Universe’s expansion history released by the DESI Collaboration offers hints at a breakdown of the standard model of cosmology.

For nearly a century, we have known that our Universe is expanding. For the past quarter-century, we have also known that this expansion is accelerating, a discovery that earned the 2011 Nobel Prize in Physics [1, 2]. But what is the mysterious “dark energy” that drives this acceleration? The simplest explanation involves what Einstein dubbed a “cosmological constant” (Λ) and implies that dark energy is a constant energy inherent to spacetime itself. This idea is the cornerstone of the standard model of cosmology, the Λ cold dark matter (ΛCDM) model, which for decades has consistently explained all available astronomical observations. Now high-precision measurements of the Universe’s expansion history are putting this model to its most stringent test yet. The Dark Energy Spectroscopic Instrument (DESI) has created a cosmic map of unprecedented scale (Fig. 1) [3–9].

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