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Area of Science:

  • Quantum Information Science
  • Quantum Networking
  • Quantum Computing

Background:

  • Quantum networks require long-distance entanglement and qubit control for distributed quantum computing.
  • Current nonlocal quantum gates are limited to short distances (tens of meters).

Purpose of the Study:

  • To demonstrate nonlocal photonic quantum gates over metropolitan-scale distances (7.0 km).
  • To establish foundational elements for large-scale distributed quantum networks.

Main Methods:

  • Utilized stationary qubits in multiplexed quantum memories.
  • Employed flying qubits at telecom wavelengths.
  • Implemented active feedforward control over field-deployed optical fibers.

Main Results:

  • Successfully demonstrated nonlocal quantum gates between nodes separated by 7.0 km.
  • Implemented quantum parallelism via the Deutsch-Jozsa and quantum phase estimation algorithms remotely.

Conclusions:

  • Proof-of-principle for quantum gates over metropolitan distances.
  • Lays the groundwork for large-scale quantum networks using existing fiber infrastructure.