Quantum light gives a 20-fold boost to ultrafast laser processes

Nonlinear interactions between light and matter are at the heart of some of the most powerful tools in modern optics, but pushing these processes to their limits has long been hampered by a fundamental constraint: the stronger you make the. The science-journalism coverage adds useful context, while the strongest evidential footing still comes from the underlying data, papers or institutional documentation.

It matters because physics only takes a result seriously when the measurement chain remains robust under scrutiny. Experimental particle physics and precision metrology both operate in regimes where the signal sits far below the background noise, and where systematic uncertainties can mimic new physics if not controlled rigorously. The history of the field contains numerous anomalies that generated theoretical excitement before better data showed them to be artifacts, and it also contains genuine discoveries that were initially dismissed as noise. The difference is almost always resolved by independent replication with different instruments and different systematics. This article has been reviewed according to Science X's editorial process and policies. Through new experiments detailed in Nature, Jian Wu and colleagues at East China Normal University in Shanghai have found a way around this problem, by exploiting the quantum.

Most optical processes are linear: if an atom is illuminated by a laser, it will absorb one photon at a time, producing a response that scales straightforwardly with the light's. When they measured the energies and momentum of the liberated electrons, the researchers found that a BSV pulse carrying just 300 nanojoules of energy on average produced the same.

The results open up a new way of controlling strong-field processes by fine-tuning the quantum character of the light source. This could prove significant for attosecond science, involving pulses of light lasting just billionths of a billionth of a second.

Until now, this field has relied almost entirely on classical laser sources, but by bringing quantum optical tools into this domain, the team's results could point toward a future. We rely on readers like you to keep independent science journalism alive.

The broader interest lies as much in the method as in the headline number, because a durable measurement procedure can travel farther than a single result. When experimental physicists develop a technique that achieves new sensitivity or controls a previously uncharacterized systematic, that methodological contribution persists even if the specific measurement is later revised. This is one reason why precision physics experiments often generate long-term value that is not immediately visible in the original publication.

Zhejun Jiang et al, Nonlinear atomic tunnelling boosted by bright squeezed vacuum, Nature (2026). Full profile → MA in English, copy editor since 2021 with experience in higher education and health content.

Because this item comes through Phys. org Physics as science journalism, it should be treated as contextual reporting rather than primary evidence. Good science reporting can identify why a result matters, connect it to the wider literature and make technical work readable, but the decisive evidence remains in the original paper, dataset, mission release or technical record. That distinction is especially important when a story is later repeated by aggregators, because repetition increases visibility, not evidential strength.

The next step is more measurement, tighter systematic control and scrutiny from groups whose experimental setups are genuinely independent. In experimental particle physics and precision metrology, the threshold for a discovery claim is a five-sigma excess surviving multiple analyses; an intriguing signal at lower significance is a reason to run more experiments, not a reason to revise the textbooks. Next-generation experiments currently under construction or commissioning will revisit several of the open questions that give the current result its context.

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