Cal Poly Researchers Create Quantum States of Matter With "No Static Counterpart" by Switching Magnetic Fields in Time

Researchers at California Polytechnic State University have created quantum states of matter that have "no static counterpart" — exotic phases that simply cannot exist in ordinary, unchanging materials — by rhythmically switching magnetic fields on and off in time rather than holding them constant.

The technique, which the team calls Flux-Switching Floquet Engineering, belongs to a fast-growing field built on a deceptively simple insight: that driving a system periodically in time can give it properties it would never possess at rest. By carefully timing changes to magnetic fields in controlled, time-dependent ways, the researchers coaxed a quantum system into configurations that have no equivalent among static materials. "Useful quantum properties can depend not just on what a material is, but on how it is driven in time," explained Ian Powell, a lecturer in the Physics Department who led the study, noting that the periodic switching produces "driven quantum phases with no static counterpart."

The work was carried out with student researcher Louis Buchalter, who earned his bachelor's degree in physics in 2025 — a reminder that meaningful contributions to quantum research increasingly emerge from undergraduate-level collaborations. The pair found that the engineered states were not only novel but notably more stable and resistant to the "noise" and imperfections that plague quantum devices.

That resilience is precisely what makes the result more than an academic curiosity. Noise is one of the central obstacles to building practical quantum computers, where fragile quantum information is easily corrupted by stray interactions with the environment. Phases that are inherently more robust to such disturbances could help protect the delicate states that quantum machines rely on to perform calculations.

The researchers also reported that their driven system exhibited mathematical patterns mirroring those found in higher-dimensional quantum systems, hinting that comparatively simple, time-driven setups might serve as accessible testbeds for probing far more complex quantum physics.

Floquet engineering — named for the 19th-century mathematician Gaston Floquet, whose work described how systems respond to periodic driving — has become one of the most active frontiers in condensed-matter physics. The same broad principle underlies time crystals, the perpetually oscillating phases that captured wide attention over the past decade. What sets the Cal Poly approach apart is its emphasis on switching the magnetic flux itself in discrete steps, a comparatively straightforward experimental knob that the authors argue could be implemented across a range of existing platforms. The findings were published in Physical Review B. As laboratories worldwide search for ways to tame quantum noise, the Cal Poly work adds to mounting evidence that the dimension of time — how a material is pushed and pulled, not just what it is made of — may be one of the most powerful and underused knobs in quantum engineering.