Construction of new type of CNOT gate using cross-resonance pulse in the transmon-PPQ system

TL;DR

This paper demonstrates a high-fidelity CNOT gate in a hybrid superconducting system combining transmon and parity-protected qubits using cross-resonance pulses, advancing quantum computing hardware.

Contribution

It introduces a novel implementation of a CNOT gate in a hybrid system with improved fidelity using cross-resonance pulses, integrating new qubit types.

Findings

Achieved CNOT gate fidelity over 0.998

Provided hardware specifications and pulse parameters for the hybrid system

Showed potential of hybrid systems as a platform for quantum computing

Abstract

The transmon, known for its fast operation time and the coherence time of tens of microseconds, is the most commonly used qubit for superconducting quantum processors. However, it is still necessary to enhance the coherence time and the gate fidelity of superconducting quantum processors for the practical implementation of fault-tolerant quantum computing. Meanwhile, a novel superconducting qubit, which has the ability to protect the Cooper-pair parity on the superconducting island, has been proposed. This new qubit shows better coherence performance than the transmon, but it does not yet have an efficient method for realizing a superconducting hybrid system that harnesses it. In this work, we show how to implement a new type of CNOT gate in a superconducting hybrid system composed of tunable transmon and parity-protected qubit by applying a cross-resonance pulse. First, we provide hardware specifications and pulse parameters to construct a successful two-qubit gate in the hybrid system. Second, we show that our method can supply a CNOT gate of average fidelity with more than 0.998. Therefore, our work implies that the hybrid system may provide a new platform for quantum computers.