Physicist develops detector capable of counting photons for quantum computing

Detecting a single photon is a challenge in itself. But what if you also want to know exactly how many photons arrive at a particular point at the same time? Physicist Erik Baalbergen is working on light detectors that can do just that. The science-journalism coverage adds useful context, while the strongest evidential footing still comes from the underlying data, papers or institutional documentation.

The significance lies in 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. Baalbergen says, "Our new detector therefore measures exactly how many light particles there were, and these measurements also provide information on how certain this result is.

One of the technical solutions Baalbergen investigated is a smart connection between the detector and the electronics that read out the signal. She is investigating how better data analysis and new AI techniques can be used to extract more information from measurement data from experiments that have already been completed.

Kuijf and Baalbergen, together with their master's student Lars Seldenthuis, came up with the idea of looking not only at the amplitude of the electrical signal but also at how. Their research was published in APS Open Science in July.

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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.

In the summer of 2026, the company launched the first working prototype of its optical quantum computer. Kuijf et al, Extracting photon-number information from superconducting nanowire single-photon detectors traces via mean-derivative projection, APS Open Science (2026).

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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