Demon-like Algorithmic Quantum Cooling and its Realization with Quantum Optics

TL;DR

This paper introduces a universal quantum cooling method, demonstrated experimentally with quantum optics, enabling the simulation of low-temperature properties of complex many-body systems that are difficult for classical approaches.

Contribution

It presents a new quantum cooling technique applicable to any quantum system, demonstrated experimentally with high fidelity, advancing quantum simulation capabilities.

Findings

Experimental realization with quantum optics network

Fidelity of the cooling process exceeds 0.978

Results match theoretical predictions

Abstract

The simulation of low-temperature properties of many-body systems remains one of the major challenges in theoretical and experimental quantum information science. We present, and demonstrate experimentally, a universal cooling method which is applicable to any physical system that can be simulated by a quantum computer. This method allows us to distill and eliminate hot components of quantum states, i.e., a quantum Maxwell's demon. The experimental implementation is realized with a quantum-optical network, and the results are in full agreement with theoretical predictions (with fidelity higher than 0.978). These results open a new path for simulating low-temperature properties of physical and chemical systems that are intractable with classical methods.