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This study demonstrates an adiabatic quantum state transfer protocol for superconducting qubits. The protocol achieves high fidelity for quantum communication and entanglement, even with significant channel loss.

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Area of Science:

  • Quantum Information Science
  • Superconducting Quantum Computing
  • Quantum Communication Systems

Background:

  • Effective quantum communication relies on high-fidelity quantum state transfer and remote entanglement generation between quantum nodes.
  • Superconducting qubits can be coupled using microwave photons or phonons, but fidelity is often limited by communication channel loss.
  • Adiabatic protocols offer a potential solution by enabling quantum state transfer without populating lossy channels.

Purpose of the Study:

  • To present and evaluate a unique superconducting quantum communication system utilizing an adiabatic protocol.
  • To investigate the system's performance in both low-loss and high-loss communication channel scenarios.
  • To compare the adiabatic protocol's efficiency and fidelity against a qubit-resonant mode-qubit relay method.

Main Methods:

  • Development of a superconducting quantum communication system with two qubits linked by a 0.73 m channel.
  • Introduction of tunable loss into the communication channel to simulate varying environmental conditions.
  • Implementation and testing of an adiabatic quantum state transfer protocol.
  • Comparison with a qubit-resonant mode-qubit relay method under different loss conditions.

Main Results:

  • The adiabatic protocol achieved 99% state transfer efficiency and 96% fidelity for deterministic entangled Bell state generation in a low-loss channel.
  • The protocol successfully transferred quantum states without populating the communication channel, outperforming the relay method in high-loss conditions.
  • The adiabatic approach demonstrated robustness against channel loss, maintaining higher state transfer and entanglement fidelities compared to the relay method.

Conclusions:

  • Adiabatic protocols are highly effective for robust quantum state transfer and entanglement generation in superconducting quantum communication systems.
  • The developed system and protocol demonstrate a significant advancement in overcoming channel loss limitations for quantum networks.
  • This work provides a viable strategy for building reliable quantum communication links essential for distributed quantum computing and secure communication.