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Researchers have demonstrated a novel method for generating attosecond pulse trains using "attoquants," which leverage intermodal entanglement to bypass traditional mode-locking requirements. This breakthrough overturns classical assumptions in high-harmonic generation by utilizing collective atomic effects that produce robust pulses even with random timing differences between wave components. The development offers new pathways for studying ultrafast atomic processes without the need for precise phase alignment, potentially simplifying experimental setups in quantum optics and attosecond science.

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Researchers Create Attosecond Pulses Without Mode-Locking

Quantum ZeitgeistSeptember 10, 20265 min read

Attosecond pulse trains conventionally demand precisely aligned harmonic emissions, a process akin to orchestral tuning before performance. However, newly described ‘attoquants’ bypass this need entirely through intermodal entanglement, generating pulses without phase-locking between harmonics. These quantum states arise from collective atomic behaviour where multiple indistinguishable sources contribute to radiation output.

Attosecond pulse trains are now generated without precisely aligning emitted harmonics, overturning classical theory. Sándor Varró and Ákos Gombkötő at the Wigner Research Centre for Physics have shown these pulses can be created by utilising newly defined quantum states called “attoquants” which exhibit intermodal entanglement. This occurs through collective atomic effects where atoms radiate indistinguishable harmonics at pressures around 10−5 Torr used in ion and electron experiments. A new method for creating attosecond pulse trains, extremely brief bursts of light, bypasses previously understood limitations within high-harmonic generation. Traditionally, generating these…

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