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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Robust multi-qubit quantum network node with integrated error detection.

P-J Stas1, Y Q Huan1, B Machielse1,2

  • 1Department of Physics, Harvard University, Cambridge, MA 02138, USA.

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We developed a quantum network node using silicon-vacancy centers in diamond, achieving over 2 seconds of memory time. This breakthrough advances long-distance quantum communication and scalable quantum repeaters.

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Area of Science:

  • Quantum Information Science
  • Solid-State Physics
  • Nanophotonics

Background:

  • Long-distance quantum communication necessitates quantum memory nodes with efficient optical interfaces and extended memory durations.
  • Integrated quantum devices are crucial for building scalable quantum networks.

Purpose of the Study:

  • To realize an integrated two-qubit network node for quantum communication.
  • To investigate the potential of silicon-vacancy centers in diamond for quantum memory applications.

Main Methods:

  • Fabrication of an integrated two-qubit network node using silicon-vacancy centers (SiVs) within diamond nanophotonic cavities.
  • Utilizing the SiV electron spin as a communication qubit and the coupled silicon-29 nuclear spin as a memory qubit.
  • Performing electron-photon and nucleus-photon entangling gate operations at cryogenic temperatures.

Main Results:

  • Achieved a quantum memory time exceeding 2 seconds for the nuclear spin qubit.
  • Demonstrated electron-photon entangling gates at temperatures up to 1.5 Kelvin.
  • Demonstrated nucleus-photon entangling gates at temperatures up to 4.3 Kelvin.
  • Implemented efficient error detection in nuclear spin-photon gates using the electron spin as a flag qubit.

Conclusions:

  • The developed integrated two-qubit network node shows promise for scalable quantum repeaters.
  • The platform offers efficient optical interfaces and long memory times essential for quantum networking.
  • Error detection capabilities enhance the reliability of quantum memory operations.