Chip-to-chip quantum photonic controlled-NOT gate teleportation

TL;DR

This paper demonstrates high-fidelity teleportation of a quantum CNOT gate between remote photonic quantum nodes using integrated silicon photonics, advancing scalable quantum network capabilities.

Contribution

It presents the first implementation of chip-to-chip quantum CNOT gate teleportation with integrated photonics and fiber interconnects, achieving high fidelity over long distances.

Findings

Quantum CNOT gate teleportation achieved with 95.69% fidelity over 5 m fiber.

Remote entanglement fidelity of 94.07% over 1 km fiber.

Gate tomography fidelity exceeds 94% for remote quantum gates.

Abstract

Quantum networks provide a novel framework for quantum information processing, significantly enhancing system capacity through the interconnection of modular quantum nodes. Beyond the capability to distribute quantum states, the ability to remotely control quantum gates is a pivotal step for quantum networks. In this Letter, we implement high fidelity quantum controlled-NOT (CNOT) gate teleportation with state-of-the-art silicon photonic integrated circuits. Based on on-chip generation of path-entangled quantum state, CNOT gate operation and chip-to-chip quantum photonic interconnect, the CNOT gate is teleported between two remote quantum nodes connected by the single-mode optical fiber. Equip with 5 m (1 km)-long interconnecting fiber, quantum gate teleportation is verified by entangling remote qubits with 95.69% +- 1.19% (94.07% +- 1.54%) average fidelity and gate tomography with 94.81% +- 0.81% (93.04% +- 1.09%) fidelity. These results advance the realization of large-scale and practical quantum networks with photonic integrated circuits.