Probabilistic teleportation of a quantum dot spin qubit

TL;DR

This paper demonstrates a quantum teleportation scheme for a single electron spin qubit in a triple quantum dot, achieving high fidelity and highlighting pathways for further improvement and application in quantum algorithms.

Contribution

It introduces a direct Bell measurement-based teleportation protocol for semiconductor spin qubits using the Pauli exclusion principle, with high fidelity results.

Findings

Teleportation fidelity of 0.91 achieved

Fidelity limited by singlet-triplet mixing

Potential for extension to larger quantum algorithms

Abstract

Electron spin s in semiconductor quantum dot s have been intensively studied for implementing quantum computation and high fidelity single and two qubit operation s have recently been achieved . Quantum teleportation is a three qubit protocol exploiting quantum entanglement and it serv es as a n essential primitive for more sophisticated quantum algorithm s Here, we demonstrate a scheme for quantum teleportation based on direct Bell measurement for a single electron spin qubit in a triple quantum dot utilizing the Pauli exclusion principle to create and detect maximally entangled state s . T he single spin polarization is teleported from the input qubit to the output qubit with a fidelity of 0.9 1 We find this fidelity is primarily limited by singlet triplet mixing which can be improved by optimizing the device parameters Our results may be extended to quantum algorithms with a larger number of se miconductor spin qubit s