Quantum teleportation with dissimilar quantum dots over a hybrid quantum network.

Area of Science:

• Quantum Information Science
• Quantum Networking
• Solid-State Quantum Systems

Background:

• Metropolitan quantum networks are crucial for cloud quantum computing, secure communication, and a global quantum internet.
• On-demand generation and long-distance teleportation of flying qubits are essential for quantum networks.
• Implementing quantum relays using distinct quantum emitters has been a significant challenge.

Purpose of the Study:

• To overcome the limitations in implementing quantum relays for distant parties.
• To demonstrate the teleportation of polarization qubits using engineered dissimilar quantum dots.
• To establish a foundation for practical, solid-state based quantum networks.

Main Methods:

• Engineered dissimilar quantum dots with tailored electronic and optical properties via light-matter interaction, strain, and magnetic fields.
• Implemented an all-photonic quantum teleportation protocol over a hybrid network including fiber and a 270m free-space optical link.
• Utilized GPS-assisted synchronization, ultra-fast single-photon detectors, and turbulence compensation systems.

Main Results:

• Successfully demonstrated quantum state teleportation of polarization qubits between dissimilar quantum dots.
• Achieved a teleportation state fidelity of 82 ± 1%, significantly exceeding the classical limit by over 10 standard deviations.
• Validated the protocol in a real-world quantum network setting connecting two campus buildings.

Conclusions:

• The study presents a novel approach to implementing solid-state based quantum relays using engineered quantum dots.
• This field demonstration of all-photonic quantum teleportation is a key step towards practical quantum networks and a quantum internet.
• The engineered quantum dot system provides a scalable platform for future quantum communication technologies.