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Quantum State Transfer between Superconducting Cavities via Exchange-Free Interactions.

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We developed a new quantum state transfer protocol using continuous squeezing interactions for superconducting cavities. This method enables bidirectional transfer of quantum information without photon exchange, advancing quantum communication and error correction.

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Area of Science:

  • Quantum Information Science
  • Superconducting Circuit Quantum Computing
  • Quantum Optics

Background:

  • Quantum state transfer is crucial for quantum networks and computing.
  • Existing methods often rely on discrete operations and photon exchange.
  • Superconducting cavities offer a promising platform for quantum information processing.

Purpose of the Study:

  • To propose and demonstrate a novel protocol for quantum state transfer between superconducting cavities.
  • To achieve continuous, symmetric, and bidirectional quantum state transfer.
  • To explore applications in quantum error correction and quantum transduction.

Main Methods:

  • Utilizing continuous two-mode squeezing interactions.
  • Generating entanglement without carrier photon exchange.
  • Experimentally demonstrating coherent state transfer in superconducting cavities.

Main Results:

  • Successful coherent and bidirectional transfer of arbitrary quantum states.
  • Demonstration of transferring bosonic quantum error correction codes.
  • Validation of a new approach for quantum transduction.

Conclusions:

  • The proposed protocol offers a novel and efficient method for quantum state transfer.
  • The continuous, entanglement-based approach overcomes limitations of discrete protocols.
  • This work has potential applications in quantum communication, computing, and transduction across various physical platforms.