Refrigeration with Indefinite Causal Orders on a Cloud Quantum Computer

TL;DR

This paper demonstrates a novel quantum refrigeration protocol leveraging indefinite causal order on a cloud quantum computer, showcasing non-classical cooling that is robust to noise and first of its kind in cloud settings.

Contribution

It introduces a new quantum refrigeration method utilizing indefinite causal order, implemented on a noisy cloud quantum platform for the first time.

Findings

Successful implementation of quantum refrigeration with indefinite causal order.

Refrigeration protocol remains robust despite noise.

First demonstration of cloud quantum refrigeration.

Abstract

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. Our protocol is by nature relatively robust to noise, and so can be implemented on this noisy platform. As far as the authors are aware, this is the first example of cloud quantum refrigeration.