@jsdodge here's some data about electric power usage of a #quantum processor prototype.

This is a poster we prepared with Kay Giang, Taufiq Murtadho, Yung Szen Yap, Paul Tan and other collaborators based on what is used at the lab of Rainer Dumke at #NTU #SG

Just before printing, Paul pointed out the power consumption of amplifiers. Turns out for more qubits the largest consumption would be from these RF electronics which amplify FPGA signals and play them into the fibers connected the cryostat to control the qubits.

The numbers mean:
Changing the state of the qubit costs negligible energy.
Running an FPGA is like watching #cats on the internet, the RF electronics in a setup for a dozen or so qubits is like the entire lab staff watching cats on their phones.
The relay PC where a remote user can run their circuits via #qibo has similar electricity usage like a laptop.

Then there's the cryostat which is using power like a few hundred regular household fridges. When you insert a chip then to test it you need to cool it down from room temperature and in steady state the consumption is lower than for cool down.

Without integrated electronics for the amplifiers then the power would scale linearly with the number of qubits (techniques such as multiplexing only lower the slope constant because of frequency crowding)
Going forward, dedicated modules will be needed or power consumption would start hitting megawatts eg if you'd want to run some cryptography applications.

We prepared these considerations for a workshop on resource costs of quantum computing by the #quantumEnergyInitiative
https://quantum-energy-initiative.org/
These numbers are for an academic lab, industry reps claimed more efficiency.