A heralded quantum gate between remote quantum memories

Abstract

We demonstrate a probabilistic entangling quantum gate between two distant trapped ytterbium ions. The gate is implemented between the hyperfine "clock" state atomic qubits and mediated by the interference of two emitted photons carrying frequency encoded qubits. Heralded by the coincidence detection of these two photons, the gate has an average fidelity of 90+-2%. This entangling gate together with single qubit operations is sufficient to generate large entangled cluster states for scalable quantum computing.

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• Error-rejecting quantum computing with solid-state spins assisted by low-Q optical microcavities
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• Ion-photon entanglement and quantum frequency conversion with trapped Ba${}^{+}$ ions
• Efficient fluorescence collection and ion imaging with the "tack" ion trap
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• Quantum Logic Between Distant Trapped Ions
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• Mitigation of birefringence in cavity-based quantum networks using frequency-encoded photons
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• Mode multiplexing for scalable cavity-enhanced operations in neutral-atom arrays
• Efficient Quantum Frequency Conversion of Ultra-Violet Single Photons from a Trapped Ytterbium Ion
• Doubly-ionized lanthanum as a qubit candidate for quantum networks