Almost all quantum computers need to be colder than outer space to work, and that is a much bigger problem than it sounds

[Megan95]

Most quantum hardware, particularly the superconducting qubits used by IBM and Google, operates at temperatures around 15 millikelvin, which is roughly a hundred times colder than deep space. Maintaining that temperature requires enormous dilution refrigerators, massive energy consumption, and engineering complexity that makes the machines effectively impossible to deploy outside of specialist facilities. This is why room-temperature quantum computing is such a significant goal. Photonic approaches and some trapped-ion systems can operate at or near room temperature, which would transform quantum computers from exotic laboratory instruments into something that could eventually sit in a data centre. Progress is being made but it is slow, and the cooling requirement remains one of the biggest practical barriers between current quantum hardware and widespread deployment.

[Oscar73]

A hundred times colder than deep space is not an engineering inconvenience, it is a fundamental constraint on where and how these machines can ever be deployed

[Demi-Q]

Photonics gets overlooked because the qubit counts are lower, but room temperature operation is a massive long-term advantage that compounds over time

[ProperJobs]

The energy cost of running dilution refrigerators at scale would be enormous. The sustainability angle on quantum hardware barely gets discussed

[QuantumKnight]

Microsoft's topological qubit approach is also partly aimed at this problem. More stable qubits at higher temperatures would be transformative if it actually works