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. 2021 Feb 5;371(6529):614-617.
doi: 10.1126/science.abe3150.

A quantum-logic gate between distant quantum-network modules

Severin Daiss #  1 , Stefan Langenfeld #  2 , Stephan Welte  2 , Emanuele Distante  2   3 , Philip Thomas  2 , Lukas Hartung  2 , Olivier Morin  2 , Gerhard Rempe  2
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A quantum-logic gate between distant quantum-network modules

Severin Daiss et al. Science. .

Abstract

The big challenge in quantum computing is to realize scalable multi-qubit systems with cross-talk-free addressability and efficient coupling of arbitrarily selected qubits. Quantum networks promise a solution by integrating smaller qubit modules to a larger computing cluster. Such a distributed architecture, however, requires the capability to execute quantum-logic gates between distant qubits. Here we experimentally realize such a gate over a distance of 60 meters. We employ an ancillary photon that we successively reflect from two remote qubit modules, followed by a heralding photon detection, which triggers a final qubit rotation. We use the gate for remote entanglement creation of all four Bell states. Our nonlocal quantum-logic gate could be extended both to multiple qubits and many modules for a tailor-made multi-qubit computing register.

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Comment in

  • Quantum logic at a distance.
    Hunger D. Hunger D. Science. 2021 Feb 5;371(6529):576. doi: 10.1126/science.abg1536. Science. 2021. PMID: 33542128 No abstract available.

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