# Transfer of a quantum state from a photonic qubit to a gate-defined quantum dot

## TL;DR

This paper proposes two protocols for transferring quantum information from photonic qubits to gate-defined quantum dot spin qubits, using excitons as intermediaries, with high success probabilities under realistic conditions.

## Contribution

It introduces novel protocols for quantum state transfer between photonic and solid-state qubits via excitons in quantum dots, supported by effective models and noise analysis.

## Key findings

- Protocols achieve 85-97% success probability
- Effective Hamiltonian models describe hybrid systems
- Realistic noise models validate protocol viability

## Abstract

Interconnecting well-functioning, scalable stationary qubits and photonic qubits could substantially advance quantum communication applications and serve to link future quantum processors. Here, we present two protocols for transferring the state of a photonic qubit to a single-spin and to a two-spin qubit hosted in gate-defined quantum dots (GDQD). Both protocols are based on using a localized exciton as intermediary between the photonic and the spin qubit. We use effective Hamiltonian models to describe the hybrid systems formed by the the exciton and the GDQDs and apply simple but realistic noise models to analyze the viability of the proposed protocols. Using realistic parameters, we find that the protocols can be completed with a success probability ranging between 85-97%.