Entangled phase of simultaneous fermion and exciton condensations realized

TL;DR

This paper demonstrates the creation and verification of fermion-exciton condensates (FECs) on quantum computers, revealing a hybrid quantum state that combines superconductivity and exciton condensation, and paving the way for future quantum material research.

Contribution

It introduces a method to prepare and verify FEC states on noisy quantum devices, confirming their existence and wave function structure experimentally.

Findings

Successfully prepared FEC states on quantum hardware

Verified the dual condensate nature through postmeasurement analysis

Opened pathways for exploring FEC properties and applications

Abstract

Fermion-exciton condensates (FECs) -- computationally and theoretically predicted states that simultaneously exhibit the character of superconducting states and exciton condensates -- are novel quantum states whose properties may involve a hybridization of superconductivity and the dissipationless flow of energy. Here, we exploit prior investigations of superconducting states and exciton condensates on quantum devices to identify a tuneable quantum state preparation entangling the wave functions of the individual condensate states. Utilizing this state preparation, we prepare a variety of FEC states on quantum computers -- realizing strongly correlated FEC states on current, noisy intermediate-scale quantum devices -- and verify the presence of the dual condensate via postmeasurement analysis. This confirmation of the previously predicted condensate state on quantum devices as well as the form of its wave function motivates further theoretical and experimental exploration of the properties, applications, and stability of FECs.