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The work shows optical initialisation and readout of triplet-exciton spin states in engineered defects in carbon nanotubes at room temperature, instead of the 2.5 K that earlier demonstrations required. The result is proof-of-principle sensing of paramagnetic molecules, not a deployed device. For quantum readers, the open questions are scalability, reproducibility outside the lab, and whether these defects can be controlled well enough for practical sensing.
Antwerp Team Reads Carbon Nanotube Spins at Room Temp
Triplet exciton spins can now be optically read out at room temperature, a leap from previous methods requiring chilling to 2. 5 K. Within single-walled carbon nanotubes, synthetically created defects trap these excitons while functioning as nanoscale proximity sensors under normal conditions.
Stable quantum sensors now operate easily outside specialist labs using precisely engineered defects within single-walled carbon nanotubes to trap triplet excitons and function as spin-photon interfaces at room temperature; this allows optical initialisation and readout of their states, demonstrating proof-of-principle sensing of paramagnetic molecules under ambient conditions. Tiny flaws within carbon nanotubes trap particles carrying quantum information, excitons, and allow them to interact with light at room temperature and under normal…
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