# Work Package 5: Quantum Energetics [Physics/Maths/Industry]

## Coordinator: Dr. R. Whitney, robert.whitney@lpmmc.cnrs.fr

Current progress in computing power is being limited by the problems of overheating of computer chips. This heating is also the main origin of a chip’s energy consumption. There is great interest in using quantum technologies to better cool such chips, or to develop new architectures

for classical or quantum computing which waste less energy as heat. These require pure and applied research to get a better understand of the rôle of heat and entropy in out-of-equilibrium nanoscale systems. For quantum computers, this issue is particularly unclear, since little is yet known about how heat and entropy are generated by quantum measurements, quantum error correction, etc. Below are some examples of topics to investigate within a PhD work.

The PhD project should preferentially be co-supervised by a mathematician and a physicist, or coached by an industrial partner

A few topics to investigate

This list is revisable, non-exhaustive and must be completed by the brain-storms and further reflexions by the QuEnG community.

• Role of entropy in a quantum computation or quantum communication.

• Entropy and heat production due to quantum measurement and decoherence

• Thermodynamics of quantum walks

• Thermodynamics of quantum control

• Applications to over-heating in a quantum computer based on "surface code"

• Heat in classical computing, quantum classical boundary

• Thermodynamics of quantum/classical transistors

• Energetics of classical computing with quantum devices

• Novel cooling techniques for quantum technologies.

• Energy filtering using superconductors...