Protocol for Hybrid Entanglement Between a Trapped Atom and a Semiconductor Quantum Dot

TL;DR

This paper proposes a protocol to generate entanglement between a trapped atom and a semiconductor quantum dot using photon interference, demonstrating robustness to experimental imperfections and enabling hybrid quantum networks.

Contribution

It introduces a novel entanglement protocol for hybrid atomic and solid-state qubits that tolerates significant physical mismatches and nonidealities.

Findings

High entanglement fidelity achievable under realistic conditions

Robustness to dispersion mismatch and multi-photon effects

Successful entanglement between trapped ion and quantum dot demonstrated

Abstract

We propose a quantum optical interface between an atomic and solid state system. We show that quantum states in a single trapped atom can be entangled with the states of a semiconductor quantum dot through their common interaction with a classical laser field. The interference and detection of the resulting scattered photons can then herald the entanglement of the disparate atomic and solid-state quantum bits. We develop a protocol that can succeed despite a significant mismatch in the radiative characteristics of the two matter-based qubits. We study in detail a particular case of this interface applied to a single trapped \Yb ion and a cavity-coupled InGaAs semiconductor quantum dot. Entanglement fidelity and success rates are found to be robust to a broad range of experimental nonideal effects such as dispersion mismatch, atom recoil, and multi-photon scattering. We conclude that it should be possible to produce highly entangled states of these complementary qubit systems under realistic experimental conditions.