Robust quantum state transfer between two superconducting qubits via partial measurement

TL;DR

This paper proposes a robust quantum state transfer method between two superconducting qubits using partial measurement, which enhances fidelity without requiring strong coupling, making it practical for real-world quantum computing.

Contribution

It introduces a novel quantum state transfer scheme utilizing partial measurement to improve fidelity in weak coupling regimes, avoiding the need for strong qubit-resonator coupling.

Findings

Partial measurement significantly improves transfer fidelity.

The scheme is effective even with qubit and resonator dissipation.

It operates efficiently in the weak coupling regime.

Abstract

We develop a potentially practical proposal for robust quantum state transfer (QST) between two superconducting qubits coupled by a coplanar waveguide (CPW) resonator. We show that the partial measurement could drastically enhance the fidelity even when the dissipation of qubits and CPW is considered. Unlike many other schemes for QST, our proposal does not require the couplings between the qubits and the CPW resonator to be strong. In fact, our method works much more efficiently in the weak coupling regime. The underlying mechanism is attributed to the probabilistic nature of partial measurement.