Benchmarking a Teleportation Protocol realized in Superconducting Circuits

TL;DR

This paper demonstrates a superconducting circuit-based quantum teleportation protocol, achieving high-fidelity state transfer and generating tripartite entanglement, advancing quantum communication and computation technologies.

Contribution

It presents the first implementation of a superconducting circuit teleportation protocol up to single-shot measurement, with comprehensive state tomography and fidelity analysis.

Findings

Achieved 88% average fidelity in teleporting quantum states

Generated genuine tripartite entangled states among three qubits

Demonstrated the protocol's viability with superconducting qubits

Abstract

Teleportation of a quantum state may be used for distributing entanglement between distant qubits in quantum communication and for quantum computation. Here we demonstrate the implementation of a teleportation protocol, up to the single-shot measurement step, with superconducting qubits coupled to a microwave resonator. Using full quantum state tomography and evaluating an entanglement witness, we show that the protocol generates a genuine tripartite entangled state of all three-qubits. Calculating the projection of the measured density matrix onto the basis states of two qubits allows us to reconstruct the teleported state. Repeating this procedure for a complete set of input states we find an average output state fidelity of 88%.