In physics, there are two great pillars of thought that don’t quite fit together. The Standard Model of particle physics describes all known fundamental particles and three forces: electromagnetism, the strong nuclear force, and the weak nuclear force. Meanwhile, Einstein’s general relativity describes gravity and the fabric of spacetime.

However, these frameworks are fundamentally incompatible in many ways, says Jonathan Heckman, a theoretical physicist at the University of Pennsylvania. The Standard Model treats forces as dynamic fields of particles, while general relativity treats gravity as the smooth geometry of spacetime, so gravity “doesn’t fit into physics’s Standard Model,” he explains.

In a recent paper in Physical Review Research, Heckman, Rebecca Hicks, a Ph.D. student at Penn’s School of Arts & Sciences, and their collaborators turn that critique on its head. Instead of asking what string theory predicts, the authors ask what it definitively cannot create. Their answer points to a single exotic particle that could show up at the Large Hadron Collider (LHC). If that particle appears, the entire string-theory edifice would be, in Heckman’s words, “in enormous trouble.”

A quantum battery operates on the principles of quantum mechanics, diverging from traditional batteries which rely on ion flow for charging and discharging. In quantum batteries, energy is stored by moving electrons into higher energy states with photons acting as charge carriers. During charging, photons transfer their energy to electrons, enabling storage.

Key quantum properties, such as entanglement and superabsorption, are harnessed to enhance the charging rate. Entanglement allows particles to function cohesively during the charging or discharging process, while superabsorption increases the energy storage capacity, leading to higher energy densities. Despite their theoretical potential and scalability, practical quantum batteries have faced challenges, with existing prototypes unable to sustain energy beyond a few nanoseconds.

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Researchers have discovered a simple yet powerful way to protect atoms from losing information—a key challenge in developing reliable quantum technologies.

By shining a single, carefully tuned laser beam on a gas of atoms, they managed to keep the atoms’ internal spins synchronized, dramatically reducing the rate at which information is lost. In quantum sensors and memory systems, atoms often lose their magnetic orientation —or “spin”—when they collide with each other or the walls of their container.

This phenomenon, known as spin relaxation, severely limits the performance and stability of such devices. Traditional methods to counteract it have required operating in extremely low magnetic fields and using bulky magnetic shielding.