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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Networking

Background:

  • Distributed quantum computing (DQC) aims to enhance computational power by networking quantum processing modules.
  • Photonic networks offer a reconfigurable interconnect for DQC, enabling logical connectivity via quantum gate teleportation (QGT).
  • Deterministic and repeatable QGT is crucial for scalable DQC architectures but has been previously unachieved.

Purpose of the Study:

  • To experimentally demonstrate the distribution of quantum computations between photonically interconnected trapped-ion modules.
  • To achieve deterministic quantum gate teleportation for scalable DQC.
  • To implement distributed quantum algorithms and operations.

Main Methods:

  • Utilized two trapped-ion modules separated by approximately two meters, each with dedicated network and circuit qubits.
  • Employed heralded remote entanglement between network qubits to deterministically teleport a controlled-Z (CZ) gate.
  • Executed Grover's search algorithm and distributed iSWAP/SWAP circuits using multiple instances of QGT.

Main Results:

  • Achieved 86% fidelity in deterministic teleportation of a CZ gate between circuit qubits in separate modules.
  • Demonstrated a 71% success rate for Grover's search algorithm, the first distributed quantum algorithm with non-local gates.
  • Successfully implemented distributed iSWAP and SWAP circuits, showcasing the distribution of arbitrary two-qubit operations.

Conclusions:

  • The demonstrated DQC architecture provides a viable pathway towards large-scale quantum computing.
  • Deterministic QGT using photonic interconnects is achievable in trapped-ion systems.
  • This approach supports a range of physical platforms for future quantum computing advancements.