Entanglement of two non-interacting qubits via a mesoscopic system

TL;DR

This paper introduces a novel method to entangle two non-interacting qubits indirectly via a mesoscopic system, using global control and collective measurements, which can enhance quantum processor architectures.

Contribution

The paper presents a new protocol for entangling qubits through indirect measurement of a mesoscopic system, requiring only global control and local interactions.

Findings

Protocol successfully entangles qubits via parity measurement

Uses post-selection based on Hamming weight

Applicable to quantum processor designs

Abstract

We propose a method for entangling two non-interacting qubits by measuring their parity indirectly through an intermediate mesoscopic system. The protocol is designed to require only global control and course-grained collective measurement of the mesoscopic system along with local interactions between the target qubits and mesoscopic system. A generalization of the method measures the hamming weight of the qubits' state and probabilistically produces an entangled state by post-selecting on hamming weight one. Our technique provides a new design element that can be integrated into quantum processor architectures and quantum measurement devices.