Captured a Single Electron at an Unmatched Speed

Now, detecting a solitary electron with a resolution of a trillion can be achieved in a mere second. This breakthrough could be crucial for advancing new generations of quantum electronic devices.

While conventional electronic circuits are packed with numerous electrons, their interactions often diminish their efficiency and performance. Is it possible to effectively manage a single electron to create a speedy and efficient circuit that operates with one electron at a time? Masaya Kataoka from the UK’s National Institute of Physics (NPL) and his team have advanced this objective by developing highly precise techniques for electron detection.

They introduced two electrons at different locations within a thin layer of the semiconductor gallium halide arsenide. The charged particles moved rapidly toward each other. When their paths drew near, the force between the electrons caused them to diverge, altering their trajectories. The researchers tracked one of the electrons and leveraged this deflection to identify the other electrons. They managed to detect it within 6 trillion interactions, which is roughly 100 times quicker than previous methods.

“Our experiments can be regarded as electrons acting as the world’s smallest sensors, detecting the world’s smallest object,” remarks Kataoka.

Team member John Fletcher at NPL explains that interactions among electrons can occur over trillion-second intervals. With this timescale now achievable, researchers are beginning to explore what two electrons do within a device and leverage this knowledge to design new electronic innovations.

Vyacheslavs Kashcheyevs from the University of Latvia believes this work could mark a pivotal point in the creation of a new generation of electronic devices reliant on high-speed single electrons. He elaborates that a single electron is inherently a quantum entity, which means future devices may harness their quantum characteristics directly, similar to their current applications in quantum computing and communication.

Researchers envision that a single-electron device could accomplish tasks akin to those performed by quantum devices that utilize a single photon, yet it would be significantly smaller. Such electron-based devices could even be integrated onto chips for convenience, says Christian Flindt from Aalto University in Finland. He emphasizes that this detection method will serve as the foundational building blocks for these potential applications.

The findings are also expected to enhance the understanding of electrical currents. Rolf Haug from Hannover University of Leibniz, Germany, notes that the current standards used for measuring current could be refined by implementing the “electron pump” utilized by the team to inject electrons in their experiments, he states.