Efficient purification protocols using iSWAP gates in solid-state qubits

TL;DR

This paper introduces a more efficient quantum state purification protocol for solid-state qubits by replacing CNOT gates with iSWAP gates, reducing complexity and fragility in quantum operations.

Contribution

The authors demonstrate that replacing CNOT with iSWAP gates in purification protocols improves efficiency and feasibility for solid-state qubits.

Findings

Reduced number of two-qubit operations needed

Applicable to breeding and hashing purification protocols

Quantitative analysis for superconducting and semiconducting qubits

Abstract

We show an efficient purification protocol in solid-state qubits by replacing the usual bilateral CNOT gate by the bilateral iSWAP gate. We also show that this replacement can be applied to breeding and hashing protocols, which are useful for quantum state purification. These replacements reduce the number of fragile and cumbersome two-qubit operations, making more feasible quantum-information-processing with solid-state qubits. As examples, we also present quantitative analyses for the required time to perform state purification using either superconducting or semiconducting qubits.