Supercoherence: Harnessing Long-Range Interactions to Preserve Collective Coherence in Disordered Systems

TL;DR

This paper introduces 'supercoherence', a phenomenon where adding a few long-range interactions in disordered synthetic quantum systems stabilizes collective coherence, potentially advancing quantum memory and information processing.

Contribution

The study demonstrates that minimal long-range interactions can induce persistent coherence in disordered quantum systems, a novel approach to mitigating decoherence.

Findings

Supercoherence creates persistent collective coherence.

Robustness against disorder up to a critical point.

Stabilizes quantum properties beyond coherence.

Abstract

Artificial quantum systems with synthetic dimensions enable exploring novel quantum phenomena difficult to create in conventional materials. These synthetic degrees of freedom increase the system's dimensionality without altering its physical structure, accessing higher-dimensional physics in lower-dimensional setups. However, synthetic quantum systems often suffer from intrinsic disorder, causing rapid decoherence that limits scalability, a major obstacle in quantum information science. Here, we show that introducing just a few long-range interactions can mitigate decoherence, creating persistent collective coherence in highly symmetric collective excited states. We term this universal phenomenon "supercoherence" and show its exceptional robustness against disorder up to a dynamical phase transition at critical interaction strength and disorder. Supercoherence stabilizes not only coherence but also all other quantum properties of the states, challenging traditional views on the inevitability of decoherence in disordered interacting quantum systems and suggesting new opportunities for quantum memory and information processing.