Fast preparation of W states with superconducting quantum interference devices by using dressed states

TL;DR

This paper presents a fast, robust protocol for preparing W states in superconducting qubits using dressed states, optimizing system evolution and reducing experimental complexity.

Contribution

The authors introduce a novel dressed state-based protocol that accelerates W state preparation and enhances robustness against decoherence and parameter variations.

Findings

Protocol is faster than adiabatic methods.

Demonstrates robustness against decoherence.

Pulse design simplifies experimental implementation.

Abstract

In this paper, we propose a protocol to prepare W states with superconducting quantum interference devices (SQUID) by using dressed states. Through choosing a set of dressed states suitably, the protocol can be used to accelerate the adiabatic passages while additional couplings are unnecessary. Moreover, we can optimize the evolution of the system with the restraint to the populations of the intermediate states by choosing suitable controlled parameters. Numerical simulations show that the protocol is robust against the parameter variations and decoherence mechanisms. Furthermore, the protocol is faster and more robust against the dephasing, compared with that by the adiabatic passages. As for the Rabi frequencies of pulses designed by the method, they can be expressed by the linear superpositions of Gaussian functions, which does not increase difficulties to the experiments. In addition, the protocol could be controlled and manipulated easily in experiments with a circuit quantum electrodynamics system.