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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Deterministic quantum state transfer and remote entanglement using microwave photons.

P Kurpiers1, P Magnard2, T Walter2

  • 1Department of Physics, ETH Zürich, Zürich, Switzerland. philipp.kurpiers@phys.ethz.ch.

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|June 15, 2018
PubMed
Summary
This summary is machine-generated.

We demonstrate a deterministic quantum network protocol for superconducting qubits. This method enables high-fidelity state transfer and entanglement, crucial for distributed quantum computing.

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Area of Science:

  • Quantum Information Science
  • Quantum Networking
  • Superconducting Quantum Circuits

Background:

  • Coherent information sharing is essential for distributed quantum information processing.
  • Direct quantum channels offer advantages for fault-tolerant quantum computation by enabling deterministic entanglement.
  • Superconducting circuits serve as universal quantum nodes capable of complex quantum operations.

Purpose of the Study:

  • To implement deterministic state-transfer and entanglement protocols between superconducting qubits on separate chips.
  • To establish a direct quantum channel for enhanced entanglement rates and distributed quantum computation.
  • To showcase the potential of superconducting circuits in building robust quantum networks.

Main Methods:

  • Utilized an all-microwave cavity-assisted Raman process.
  • Entangled superconducting qubits (transmon-type artificial atoms) with itinerant single photons.
  • Achieved state transfer by photon absorption at the receiving node.

Main Results:

  • Demonstrated deterministic qubit state transfer with 98.1% probability and 80.02% fidelity in 180 nanoseconds.
  • Achieved on-demand remote entanglement with 78.9% fidelity at a rate of 50 kilohertz.
  • Results showed excellent agreement with master-equation simulations.

Conclusions:

  • The implemented deterministic protocol is a significant step towards building distributed quantum computing systems.
  • This method provides a viable approach for reliable information sharing in quantum networks.
  • The high fidelity and rate of entanglement are promising for future quantum network applications.