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Finite-time quantum entanglement in propagating squeezed microwaves.

K G Fedorov1,2, S Pogorzalek3,4, U Las Heras5

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Researchers generated microwave two-mode squeezed states for quantum communication. They studied dephasing in these states, providing insights into entanglement limits and high fidelities for quantum protocols.

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Area of Science:

  • Quantum optics
  • Quantum information science
  • Microwave quantum devices

Background:

  • Two-mode squeezing (TMS) is a quantum entanglement phenomenon showing cross-correlations between subsystems.
  • TMS states are valuable resources for quantum communication, despite individual subsystems lacking quantum signatures.
  • Propagating microwave states are crucial for practical quantum communication applications.

Purpose of the Study:

  • To generate propagating microwave two-mode squeezed states.
  • To experimentally investigate the dephasing of quantum cross-correlations in continuous-variable microwave TMS states.
  • To develop a theory model for dephasing and predict performance for quantum communication protocols.

Main Methods:

  • Generation of propagating microwave TMS states using a beam splitter and Josephson parametric amplifiers.
  • Experimental study of dephasing processes affecting quantum cross-correlations.
  • Theoretical modeling of dephasing and prediction of fidelities for quantum communication protocols.

Main Results:

  • Successful generation of propagating microwave TMS states.
  • Accurate description of the fundamental dephasing process in these states.
  • Insights into finite-time entanglement limits for continuous-variable microwave states.

Conclusions:

  • The study provides a comprehensive understanding of dephasing in microwave TMS states.
  • The findings predict high fidelities for quantum communication protocols like remote state preparation and quantum teleportation.
  • This work advances the development of quantum communication technologies using microwave quantum states.