Necessity vs. Sufficiency – What matters when bringing quantum technologies to market

Why are record values alone not enough?

Conversations about single-photon detection quickly turn to record numbers: maximum detection efficiency, minimum dark count rate, lowest possible jitter . In research, this logic makes sense — anyone working at the limit of what is measurable wants to optimise every percent and every picosecond. But once a detector is meant to become a technology for real applications, this view alone is no longer enough .

Which perspectives collide?

The quantum researcher asks: How close can we get to what is physically possible? The engineer asks: Does the system fit the application? And the business person asks: Can it be manufactured and scaled economically? All three perspectives are legitimate — which is why the decisive question is often not what is theoretically best, but what is actually needed in practice.

What is the real benchmark?

From our perspective, the guiding question is: What is actually necessary in practice — and what is already sufficient? That is the decisive benchmark for good detector technology . Not every application needs the extreme value in every metric. In some cases, peak efficiency is critical. In others, it matters more that a detector is robustly integrable , fits into an existing system, or can be built within a cost structure that makes later scaling possible at all .

Why is this balance particularly demanding today?

Many quantum applications are still in the lab . There, performance limits are in the foreground, while cost and manufacturability initially play a smaller role. Industrial applications, by contrast, are strongly driven by reliability, system compatibility and unit cost . At the same time, they often also require a real performance leap to displace existing solutions. From this tension emerges the core question: Which added value justifies which added cost?

How does GeQD approach this?

At GeQD, we see this question not as a constraint, but as a development principle . Our ambition is not to maximise every single metric in isolation. Our ambition is to build detectors that are relevant for real applications — technically, systemically and commercially .

What does this mean in development?

We do not only ask what is physically possible. We ask what performance an application actually needs , where additional performance makes a real difference, and from which point on "more" does not automatically mean "better" . For us, the sufficiency-and-necessity criterion is therefore more than an idea — it is the bridge between research and product .

Where does GeQD position itself?

This is exactly where GeQD operates: at the intersection of quantum-grade performance and practical feasibility . We do not just want to push single-photon detection further toward physical limits; we want to bring it into systems where it creates a clear, well-founded benefit . Only then does a strong metric turn into a relevant technology.

Universität Stuttgart – Institut für Halbleitertechnik

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Pfaffenwaldring 47

70569 Stuttgart, Deutschland

Tel: +49 711 68560896

info@geqd.de

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