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A quantum-logic gate between distant quantum-network modules

Daiss, Severin; Langenfeld, Stefan; Welte, Stephan; Distante, Emanuele; Thomas, Philip; Hartung, Lukas; Morin, Olivier; Rempe, Gerhard

SCIENCE
2021
VL / 371 - BP / 614 - EP / +
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.

AccesS level

Green submitted

MENTIONS DATA