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<\/a><\/p>\nUsing Higgs echo spectroscopy, Huang et al. uncovered unconventional echo formation caused by inhomogeneous broadening and soft quasiparticle bands, which dynamically evolve under THz driving. Image credit: Ames National Laboratory.<\/p>\n
Superconductors are materials that carry electricity without resistance.<\/p>\n
Within these superconductors are collective vibrations known as Higgs modes.<\/p>\n
A Higgs mode is a quantum phenomenon that occurs when its electron potential fluctuates in a similar way to a Higgs boson.<\/p>\n
They appear when a material is undergoing a superconducting phase transition.<\/p>\n
Observing these vibrations has been a long-time challenge for scientists because they exist for a very short time.<\/p>\n
They also have complex interactions with quasiparticles, which are electron-like excitations that emerge from the breakdown of superconductivity.<\/p>\n
However, using advanced terahertz (THz) spectroscopy techniques, the research team discovered a novel type of quantum echo, called the Higgs echo, in superconducting niobium materials used in quantum computing circuits.<\/p>\n
\u201cUnlike conventional echoes observed in atoms or semiconductors, the Higgs echo arises from a complex interaction between the Higgs modes and quasiparticles, leading to unusual signals with distinct characteristics,\u201d said Dr. Jigang Wang, a researcher at Ames National Laboratory.<\/p>\n
\u201cThe Higgs echo can remember and reveal hidden quantum pathways within the material.\u201d<\/p>\n
By using precisely timed pulses of THz radiation, the authors were able to observe these echoes.<\/p>\n
Using these THz radiation pulses, they can also use the echoes to encode, store, and retrieve quantum information embedded within this superconducting material.<\/p>\n
This research demonstrates the ability to control and observe quantum coherence in superconductors and paves the way for potential new methods of quantum information storage and processing.<\/p>\n
\u201cUnderstanding and controlling these unique quantum echoes brings us a step closer to practical quantum computing and advanced quantum sensing technologies,\u201d Dr. Wang said.<\/p>\n