Quantum state transfer between a frequency-encoded photonic qubit and a quantum dot spin in a nanophotonic waveguide

TL;DR

This paper proposes a passive scheme for high-fidelity quantum state transfer from frequency-encoded photons to quantum dot spins using nanophotonic waveguides, advancing solid-state quantum networks.

Contribution

It introduces a deterministic, fully passive method for quantum state transfer between frequency-encoded photons and quantum dot spins in nanophotonic waveguides, with realistic fidelity estimates.

Findings

Transfer fidelity exceeding 95% is achievable with realistic parameters.

The scheme is fully passive and deterministic.

It enables the development of solid-state quantum networks.

Abstract

We propose a deterministic yet fully passive scheme to transfer the quantum state from a frequency-encoded photon to the spin of a quantum-dot mediated by a nanophotonic waveguide. We assess the quality of the state transfer by studying the effects of all relevant experimental imperfections on the state-transfer fidelity. We show that a transfer fidelity exceeding 95% is achievable for experimentally realistic parameters. Our work sets the stage for deterministic solid-state quantum networks tailored to frequency-encoded photonic qubits.