Efficient entanglement of spin qubits mediated by a hot mechanical oscillator

TL;DR

This paper proposes a robust scheme for entangling distant solid-state spin qubits using a hot mechanical oscillator, enabling high-fidelity quantum operations at various temperatures.

Contribution

It introduces a heralded, parity measurement-based entanglement scheme that works efficiently with a hot mechanical oscillator, advancing scalable quantum information processing.

Findings

High-fidelity entanglement feasible at cryogenic and ambient temperatures

Entanglement can be used for deterministic CNOT operations between nuclear spins

Scheme is robust and compatible with realistic experimental parameters

Abstract

Localized electronic and nuclear spin qubits in the solid state constitute a promising platform for storage and manipulation of quantum information, even at room temperature. However, the development of scalable systems requires the ability to entangle distant spins, which remains a challenge today. We propose and analyze an efficient, heralded scheme that employs a parity measurement in a decoherence free subspace to enable fast and robust entanglement generation between distant spin qubits mediated by a hot mechanical oscillator. We find that high-fidelity entanglement at cryogenic and even ambient temperatures is feasible with realistic parameters, and show that the entangled pair can be subsequently leveraged for deterministic controlled-NOT operations between nuclear spins. Our results open the door for novel quantum processing architectures for a wide variety of solid-state spin qubits.