Nonequilibrium transport in ultracold Fermions

A single cloud of ultracold atoms will be transformed from one quantum state to another in record time, then used to extract work in a microscopic heat engine. This project tackles a fundamental bottleneck in quantum technologies: the speed limit on state preparation. Normally, changing a quantum system slowly preserves its order, but fast changes cause unwanted excitations that destroy the state. The researchers will test "shortcuts to adiabaticity"—clever control sequences that skip the slow wait and jump directly to the target state without the chaos. They will then plug these shortcuts into a thermal machine, a tiny engine that converts heat into work, to see if faster cycles yield more usable energy. The work is fundamental science. There is no immediate application to power grids or refrigerators. But understanding how to rapidly prepare and manipulate quantum states without losing control is essential for future quantum computers, sensors, and energy-conversion devices. Past fundamental studies of ultracold atoms, for example, directly led to the atomic clocks that now underpin GPS navigation. This project could similarly lay the groundwork for faster, more efficient quantum engines or simulators that model complex materials.