Programmable Microwave Cluster States via Josephson Metamaterials

TL;DR

This paper demonstrates the on-demand generation of scalable, reconfigurable microwave cluster states using a programmable Josephson Traveling-Wave Parametric Amplifier, advancing measurement-based quantum computing in superconducting circuits.

Contribution

It introduces a method to engineer and verify multimode entangled microwave cluster states with reconfigurable nonlinear couplings via tailored pump tones.

Findings

Successful generation of multimode microwave cluster states

Reconfigurable entanglement via pump spectrum control

Scalability demonstrated through wide bandwidth and homogeneity

Abstract

Cluster states are a fundamental resource for continuous-variable quantum computing, enabling measurement-based protocols that can scale beyond the limitations of qubit-based architectures. Here, we demonstrate on-demand generation of multimode entangled microwave cluster states using a programmable Josephson Traveling-Wave Parametric Amplifier (JTWPA) operated in the three-wave mixing regime. By injecting a tailored, non-equidistant set of pump tones via an arbitrary waveform generator, we engineer frequency-specific nonlinear couplings between multiple frequency modes. The entanglement structure is verified via frequency-resolved heterodyne detection of quadrature nullifiers, confirming the target graph topology of the cluster state. Our approach allows reconfigurability through the pumps spectrum and supports scalability by leveraging the wide bandwidth and spatial homogeneity of the JTWPA. This platform opens new avenues for scalable measurement-based quantum information processing in the microwave domain, compatible with superconducting circuit architectures.