Synthetic $\pi$-flux system in 2D superconducting qubit array with tunable coupling

TL;DR

This paper reports the experimental creation of a synthetic $$-flux system in a 2D superconducting qubit array with tunable couplings, enabling exploration of exotic quantum phenomena related to flat-band physics.

Contribution

It demonstrates the first experimental realization of a $$-flux rhombic system in a scalable superconducting qubit platform with tunable couplings.

Findings

Observation of $$-flux driven destructive interference

Successful protocol for eigenstate preparation in the system

Potential for studying geometry-interaction-quantum information interplay

Abstract

Flat-band systems provide an ideal platform for exploring exotic quantum phenomena, where the strongly suppressed kinetic energy in these flat energy bands suggests the potential for exotic phases driven by geometric structure, disorder, and interactions. While intriguing phenomena and physical mechanisms have been unveiled in theoretical models, synthesizing such systems within scalable quantum platforms remains challenging. Here, we present the experimental realization of a $\pi$-flux rhombic system using a two-dimensional superconducting qubit array with tunable coupling. We experimentally observe characteristic dynamics, e.g., $\pi$-flux driven destructive interference, and demonstrate the protocol for eigenstate preparation in this rhombic array with coupler-assisted flux. Our results provide future possibilities for exploring the interplay of geometry, interactions, and quantum information encoding in such degenerate systems.