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.
Highlights
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
Teleportation has been demonstrated in many experimental quantum information processing platforms[2,3,4,5,6,7], and it is an essential tool for quantum error correction[8], measurement-based quantum computing[9], and quantum gate teleportation[10]
As mentioned above and discussed further in “Methods”, the conditional quantum teleportation protocol we have developed is compatible with arbitrary qubit states
Summary
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. 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. Separating entangled pairs of spins to remote locations, as required for quantum teleportation, has previously presented the main challenge to teleportation in quantum dots We overcome this challenge using a recently demonstrated technique to distribute entangled spin states via Heisenberg exchange[11]. Our teleportation method leverages Pauli spin blockade, a unique feature of electrons in quantum dots, to generate and measure entangled pairs of spins We combine these concepts to perform conditional teleportation in a system of four GaAs quantum-dot spin qubits. We use coherent spin-state transfer via Heinseberg exchange[11] to distribute entangled pairs of spins, other methods to create long-range-entangled states of spins including tunneling[15,16,17] and coupling via superconducting resonators[18] could be used as well
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