Controlled-NOT logic gate for phase qubits based on conditional spectroscopy

TL;DR

This paper demonstrates a high-fidelity controlled-NOT gate for phase qubits using conditional spectroscopy, achieving over 99% fidelity within 45 nanoseconds, advancing quantum computing capabilities.

Contribution

It introduces a method for implementing a CNOT gate on phase qubits with high fidelity using conditional spectroscopy techniques.

Findings

Intrinsic fidelity exceeds 99%

Gate operation time is 45 nanoseconds

Applicable to coupled phase qubits and resonators

Abstract

A controlled-NOT logic gate based on conditional spectroscopy has been demonstrated recently for a pair of superconducting flux qubits [Plantenberg et al., Nature 447, 836 (2007)]. Here we study the fidelity of this type of gate applied to a phase qubit coupled to a resonator (or a pair of capacitively coupled phase qubits). Our results show that an intrinsic fidelity of more than 99% is achievable in 45ns.