Quantum switch: Miracle material uses magnetism to encode information in excitons

Scientists found a temperature-controlled method to manipulate excitons in chromium sulfide bromide (CrSBr). At very low temperatures, CrSBr becomes magnetic, trapping excitons in single layers. As temperatures rise, it loses magnetism, allowing excitons to move freely. This magnetic "switch" could revolutionize quantum devices and information technology.

Using ultra-short laser pulses, researchers created and manipulated excitons in CrSBr, discovering they split into two energy levels and behaved differently based on movement direction. This temperature-dependent control of excitons offers a powerful way to manage information flow in quantum systems.