Floquet Engineering of Anisotropic Transverse Interactions in Superconducting Qubits

TL;DR

This paper demonstrates Floquet engineering to create anisotropic transverse interactions in superconducting transmon qubits, enabling exploration of complex quantum phases and dynamical transitions in a scalable quantum system.

Contribution

It introduces a method to realize and control anisotropic transverse interactions between transmon qubits using Floquet engineering, expanding the capabilities for quantum simulation.

Findings

Successfully synthesized anisotropic transverse interactions in a 6-qubit chain.

Realized a transverse field Ising model and observed its dynamical phase transition.

Enabled independent control over XX and YY interaction terms.

Abstract

Superconducting transmon qubits have established as a leading candidate for quantum computation, as well as a flexible platform for exploring exotic quantum phases and dynamics. However, physical coupling naturally yields isotropic transverse interactions between qubits, restricting their access to diverse quantum phases that require spatially dependent interactions. Here, we demonstrate the simultaneous realization of both pairing (XX-YY) and hopping (XX+YY) interactions between transmon qubits by Floquet engineering. The coherent superposition of these interactions enables independent control over the XX and YY terms, yielding anisotropic transverse interactions. By aligning the transverse interactions along a 1D chain of six qubits, as calibrated via Aharonov-Bohm interference in synthetic space, we synthesize a transverse field Ising chain model and explore its dynamical phase transition under varying external field. The scalable synthesis of anisotropic transverse interactions paves the way for the implementation of more complex physical systems requiring spatially dependent interactions, enriching the toolbox for engineering quantum phases with superconducting qubits.