Quantum teleportation from a propagating photon to a solid-state spin qubit

Area of Science:

• Quantum Information Science
• Quantum Computing
• Solid-State Physics

Background:

• Establishing a quantum interface between flying photonic qubits and stationary spin qubits is crucial for quantum networks.
• Quantum teleportation offers a viable method for interfacing dissimilar quantum systems.

Purpose of the Study:

• To experimentally demonstrate the transfer of quantum information from a photon to a semiconductor spin qubit via quantum teleportation.
• To showcase the feasibility of creating a quantum interface between photons and solid-state spins.

Main Methods:

• Generation of a single photon in a superposition state via resonant excitation of a neutral quantum dot.
• Creation of an entangled spin-photon state in a second, spatially separated quantum dot.
• Interference of photons from both quantum dots in a Hong-Ou-Mandel interferometer.
• Verification of teleportation by measuring the spin state using optical spin-echo to extend coherence time.

Main Results:

• Successful quantum teleportation of a photonic qubit onto a semiconductor spin qubit.
• Achieved high photon indistinguishability, crucial for heralded teleportation.
• Demonstrated the preservation and measurement of the transferred quantum information in the spin qubit.

Conclusions:

• Experimental validation of quantum teleportation between photons and semiconductor spins.
• Significant advancement in developing interfaces for quantum information transfer and storage.
• Potential for scalable quantum networks and robust quantum computing architectures.