  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.
