Entanglement of trapped-ion qubits separated by 230 meters

Abstract

We report on an elementary quantum network of two atomic ions separated by 230 m. The ions are trapped in different buildings and connected with 520(2) m of optical fiber. At each network node, the electronic state of an ion is entangled with the polarization state of a single cavity photon; subsequent to interference of the photons at a beamsplitter, photon detection heralds entanglement between the two ions. Fidelities of up to $(88.2+2.3-6.0)\%$ are achieved with respect to a maximally entangled Bell state, with a success probability of $4\times 10^{-5}$. We analyze the routes to improve these metrics, paving the way for long-distance networks of entangled quantum processors.

References in corpus (11)

• The Quantum Internet
• Quantum computing with trapped ions
• An Elementary Quantum Network of Single Atoms in Optical Cavities
• An ${}^{27}$Al${}^{+}$ quantum-logic clock with systematic uncertainty below $10^{-18}$
• Realization of a multi-node quantum network of remote solid-state qubits
• Distributed Quantum Computation Based-on Small Quantum Registers
• Modular Entanglement of Atomic Qubits using both Photons and Phonons
• Tunable ion-photon entanglement in an optical cavity
• Enhanced Quantum Interface with Collective Ion-Cavity Coupling
• Raman spectroscopy of a single ion coupled to a high-finesse cavity
• Entanglement of distinguishable quantum memories

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