New method generates nearly indistinguishable photons for quantum communication

Quantum Technology

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Phys.org • October 1, 2026

Researchers from Paderborn University, the University of Basel, and Ruhr University Bochum have developed a method to generate nearly indistinguishable photons for quantum communication. In their paper published in *Physical Review Letters*, they show that special semiconductor nanostructures can produce individual photons and pairs that are almost perfectly identical. These particles form the basis for quantum entanglement and interference, which are essential for complex calculations using light.

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New parallel gate entangles diamond qubits 10 times faster at room temperature

Quantum Technology

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Phys.org • October 1, 2026

Researchers at the University of Pennsylvania have developed a new method to entangle diamond qubits ten times faster than previous techniques while operating at room temperature. This breakthrough involves using a nitrogen-vacancy center, a tiny defect in diamond where a nitrogen atom sits next to a missing carbon atom. The team utilized an electron at this defect and three nearby carbon-13 nuclei to create four qubits. By applying a precisely timed sequence of controls, the electron interacted with all three nuclear qubits simultaneously in a single gate operation. This approach generated a four-qubit Greenberger–Horne–Zeilinger state, a specific type of entanglement where the qubits share a combined quantum arrangement.

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Quantum chip holds multiple photons at once, opening path to scalable memory

Quantum Technology

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Phys.org • October 9, 2026

Researchers at the University of Illinois Urbana-Champaign have developed a new chip that can store multiple photons for over one microsecond. Photons are particles of light used to carry quantum information, but they are often difficult to pause while other operations occur. This storage must happen on chips no larger than one centimeter, a distance light travels in just a few trillionths of a second. Storing light for even a single microsecond represents a significant leap forward for quantum technology.

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Light reads electron spins inside porous crystals, opening path to quantum chemical sensors

Quantum Technology

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Phys.org • October 9, 2026

University of Glasgow researchers led an international team to use light for the first time to read the magnetic spin of electrons trapped inside porous crystals called metal-organic frameworks (MOFs). These materials are rigid, sponge-like structures made of metal ions connected by organic molecules. The study, published in the Journal of the American Chemical Society in 2026, builds on a technique known as optically detected magnetic resonance, or ODMR. This method allows scientists to detect electron spins using light rather than microwaves, offering higher sensitivity and spatial resolution than previous methods like electron spin resonance.

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Ultrafast core-level spectroscopy reveals elusive precursors of exciton condensation in quantum materials

Quantum Technology

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Phys.org • October 9, 2026

Researchers used ultrafast core-level spectroscopy to study a quantum material called 1T-TiSe2, which undergoes a phase transition at approximately 200 Kelvin. Below this temperature, the material forms a charge-density wave where electronic density and atomic lattice become periodically modulated. For decades, scientists have debated whether excitons play a central role in creating this state. An exciton is formed when an electron moves from the valence band to the conduction band, binding with the positively charged hole it leaves behind through electrical attraction.

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Three quantum-inspired cores leave opposite fingerprints on the ringing of black holes

Quantum Technology

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Phys.org • October 9, 2026

Three researchers have calculated how three different quantum gravity models affect the sound a black hole makes after merging. In Einstein’s standard theory, gravity has a fixed strength everywhere. However, some quantum theories suggest gravity changes depending on distance. The team found that if gravity weakens at very short distances, the resulting black hole rings at a higher pitch and for a longer time. Conversely, if gravity strengthens near the center, the black hole rings at a lower pitch and fades away more quickly.

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Hybrid quantum computer observes foundational quantum effect in a new setting

Quantum Technology

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Phys.org • October 10, 2026

Physicists at the University of Oxford have observed the Aharonov–Bohm effect using a hybrid quantum computer made of qubits and quantum oscillators. This phenomenon occurs when a charged particle acquires a measurable phase by traveling around a magnetic flux without passing through a region where a magnetic field exists. The study, published in Nature Physics, shows how these systems can simulate interactions between matter and gauge fields that are too complex for classical computers to model.

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Liquid-crystal-like magnetism explains puzzling properties in a rare-earth compound

Quantum Technology

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Phys.org • October 8, 2026

Researchers led by Pengcheng Dai at Rice University discovered that quantum spins in the rare-earth compound YbMnBi₂ behave like molecules in a liquid crystal. In this state, spins favor a specific direction without forming large-scale magnetic order. This phenomenon was observed when the team fired neutron beams at crystals of YbMnBi₂ and a related calcium compound to measure spin fluctuations under varying temperatures and magnetic fields.

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How researchers tell different quantum excitations apart in individual molecules

Quantum Technology

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Phys.org • October 8, 2026

Dr. Arnab Banerjee and his colleagues faced a challenge when studying individual cobaltocene molecules using tunneling spectroscopy. The measured spectra displayed confusing signals caused by various excitations, making it difficult to determine which specific process created each measurement signal because theoretical models were unreliable. To solve this, the team placed the molecules on a lead surface that becomes superconducting at very low temperatures and used a scanning tunneling microscope with a metallic tip positioned extremely close to the molecule to allow electrons to cross the tiny gap.

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Layered semiconductor unlocks magnetic control of light emitted by quantum condensates

Quantum Technology

AI-rewritten: This is a summary of an article from Phys.org, rewritten by AI (Qwen, running locally) to make it easier to read. The facts come from the original article – read it for the full story.

Phys.org • October 8, 2026

Researchers have developed a method to control light emitted by quantum condensates using the magnetic properties of a new layered semiconductor called chromium sulfide bromide (CrSBr). Unlike traditional semiconductors that require extreme cooling, this material allows exciton–polaritons to form at moderate temperatures. Exciton–polaritons are hybrid states created when electron-hole pairs, known as excitons, couple with light in an optical resonator. This coupling reduces their effective mass, enabling them to move in lockstep and form a macroscopic quantum state that emits coherent light.

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