High-fidelity resonator-induced phase gate with single-mode squeezing

TL;DR

This paper demonstrates that using narrowband single-mode squeezed drive in circuit QED can significantly enhance the fidelity of two-qubit resonator-induced phase gates by minimizing qubit dephasing.

Contribution

It introduces an optimal squeezing strategy to improve gate fidelity in circuit QED, supported by analytical and numerical validation.

Findings

Achieves a controlled-phase gate with 200 ns duration and $10^{-5}$ infidelity.

Optimal squeezing angle and strength reduce qubit dephasing.

Analytical results align well with numerical simulations.

Abstract

We propose to increase the fidelity of two-qubit resonator-induced phase gates in circuit QED by the use of narrowband single-mode squeezed drive. We show that there exists an optimal squeezing angle and strength that erases qubit 'which-path' information leaking out of the cavity and thereby minimizes qubit dephasing during these gates. Our analytical results for the gate fidelity are in excellent agreement with numerical simulations of a cascaded master equation that takes into account the dynamics of the source of squeezed radiation. With realistic parameters, we find that it is possible to realize a controlled-phase gate with a gate time of 200 ns and average infidelity of $10^{-5}$.