Refrigeration with Indefinite Causal Orders on a Cloud Quantum Computer

Understand

We demonstrate non-classical cooling on the IBMq cloud quantum computer.

• We implement a recently proposed refrigeration protocol which relies upon indefinite causal order for its quantum advantage.
• We use quantum channels which, when used in a well-defined order, are useless for refrigeration.
• We are able to use them for refrigeration, however, by applying them in a superposition of different orders.