1. Institut für Experimentalphysik, Universität Innsbruck, Technikerstrae 25, A-6020 Innsbruck, Austria
2. Theoretical Division T-4, Los Alamos National Laboratory, Los Alamos NM 87545, USA
3. Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Technikerstrae 25, A-6020 Innsbruck, Austria

Correspondence to: R. Blatt^1,3 Email: Rainer.Blatt@uibk.ac.at

Abstract

Teleportation of a quantum state encompasses the complete transfer of information from one particle to another. The complete specification of the quantum state of a system generally requires an infinite amount of information, even for simple two-level systems (qubits). Moreover, the principles of quantum mechanics dictate that any measurement on a system immediately alters its state, while yielding at most one bit of information. The transfer of a state from one system to another (by performing measurements on the first and operations on the second) might therefore appear impossible. However, it has been shown¹ that the entangling properties of quantum mechanics, in combination with classical communication, allow quantum-state teleportation to be performed. Teleportation using pairs of entangled photons has been demonstrated^{2, 3, 4, 5, 6}, but such techniques are probabilistic, requiring post-selection of measured photons. Here, we report deterministic quantum-state teleportation between a pair of trapped calcium ions. Following closely the original proposal¹, we create a highly entangled pair of ions and perform a complete Bell-state measurement involving one ion from this pair and a third source ion. State reconstruction conditioned on this measurement is then performed on the other half of the entangled pair. The measured fidelity is 75%, demonstrating unequivocally the quantum nature of the process.

1. Institut für Experimentalphysik, Universität Innsbruck, Technikerstrae 25, A-6020 Innsbruck, Austria
2. Theoretical Division T-4, Los Alamos National Laboratory, Los Alamos NM 87545, USA
3. Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Technikerstrae 25, A-6020 Innsbruck, Austria

Correspondence to: R. Blatt^1,3 Email: Rainer.Blatt@uibk.ac.at

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