Conditional teleportation of quantum dot spin states

Jia Jun Wong, Jian Cheng Yang, Paul G. Kwiat

Alexey N. Pyrkov, Tim Byrnes

Haifeng Qiao, Yadav P. Kandel, Sreenath K. Manikandan +5 more

Among the different platforms for quantum information processing, individual electron spins in semiconductor quantum dots stand out for their long coherence times and potential for scalable fabrication. The past years have witnessed substantial progress in the capabilities of spin qubits. However, coupling between distant electron spins, which is required for quantum error correction, presents a challenge, and this goal remains the focus of intense research. Quantum teleportation is a canonical method to transmit qubit states, but it has not been implemented in quantum-dot spin qubits. Here, we present evidence for quantum teleportation of electron spin qubits in semiconductor quantum dots. Although we have not performed quantum state tomography to definitively assess the teleportation fidelity, our data are consistent with conditional teleportation of spin eigenstates, entanglement swapping, and gate teleportation. Such evidence for all-matter spin-state teleportation underscores the capabilities of exchange-coupled spin qubits for quantum-information transfer.

Hefeng Wang, Sabre Kais

Haifeng Qiao, Yadav P. Kandel, Sreenath K. Manikandan +5 more

Abstract Among the different platforms for quantum information processing, individual electron spins in semiconductor quantum dots stand out for their long coherence times and potential for scalable fabrication. The past years have witnessed substantial progress in the capabilities of spin qubits. However, coupling between distant electron spins, which is required for quantum error correction, presents a challenge, and this goal remains the focus of intense research. Quantum teleportation is a canonical method to transmit qubit states, but it has not been implemented in quantum-dot spin qubits. Here, we present evidence for quantum teleportation of electron spin qubits in semiconductor quantum dots. Although we have not performed quantum state tomography to definitively assess the teleportation fidelity, our data are consistent with conditional teleportation of spin eigenstates, entanglement swapping, and gate teleportation. Such evidence for all-matter spin-state teleportation underscores the capabilities of exchange-coupled spin qubits for quantum-information transfer.

KE-XIANG HU, Bai-Qi Jin, Qingkang Wang

In this article, we propose an experimental scheme for implementing quantum teleportation of tripartite GHZ-Like state under the control of the controller. Due to the entanglement produced by the interaction between quantum dots embedded in microcavities and a single photon, the controlled quantum teleportation scheme of tripartite GHZ-Like state encoded in the electron spins in quantum dots can be realized in terms of theory via the conditional Faraday rotation of the polarization of single photons, single photons detection, and electron spin orientation measurement. By choosing the appropriate Faraday rotation angle for the switchable microcavities, the success probability of controlled quantum teleportation can reach 1. The similar controlled quantum teleportation procedure discussed here can be generalized to the quantum teleportation of multipartite GHZ-Like state.