Experimental Perfect Quantum State Transfer

TL;DR

This paper demonstrates a photonic quantum state transfer protocol achieving high fidelity, crucial for quantum computing data transfer, by extending perfect state transfer to entangled photonic qubits with a 97.1% average fidelity.

Contribution

It introduces an implementation of perfect quantum state transfer for entangled photonic qubits, maintaining polarization encoding with high fidelity.

Findings

Achieved 97.1% average fidelity in quantum state transfer.

Extended perfect state transfer to entangled photonic qubits.

Demonstrated feasibility for quantum data transfer in quantum computing.

Abstract

The transfer of data is a fundamental task in information systems. Microprocessors contain dedicated data buses that transmit bits across different locations and implement sophisticated routing protocols. Transferring quantum information with high fidelity is a challenging task, due to the intrinsic fragility of quantum states. We report on the implementation of the perfect state transfer protocol applied to a photonic qubit entangled with another qubit at a different location. On a single device we perform three routing procedures on entangled states with an average fidelity of 97.1%. Our protocol extends the regular perfect state transfer by maintaining quantum information encoded in the polarisation state of the photonic qubit. Our results demonstrate the key principle of perfect state transfer, opening a route toward data transfer for quantum computing systems.