Synthesis of antisymmetric spin exchange interaction and entanglement generation with chiral spin states in a superconducting circuit

TL;DR

This paper reports the synthesis of antisymmetric spin exchange interactions in a superconducting circuit, enabling the study of chiral spin dynamics, logic gates, and multi-qubit entanglement for quantum simulation and computation.

Contribution

The work demonstrates the first realization of antisymmetric spin exchange interactions and chiral spin states in a superconducting circuit, including chiral logic gates and multi-qubit entanglement.

Findings

Realized antisymmetric spin exchange interaction in superconducting qubits.

Demonstrated chiral spin dynamics in multi-qubit clusters.

Generated GHZ states with up to five qubits.

Abstract

We have synthesized the anti-symmetric spin exchange interaction (ASI), which is also called the Dzyaloshinskii-Moriya interaction, in a superconducting circuit containing five superconducting qubits connected to a bus resonator, by periodically modulating the transition frequencies of the qubits with different modulation phases. This allows us to show the chiral spin dynamics in three-, four- and five-spin clusters. We also demonstrate a three-spin chiral logic gate and entangle up to five qubits in Greenberger-Horne-Zeilinger states. Our results pave the way for quantum simulation of magnetism with ASI and quantum computation with chiral spin states.