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Stabilizing Entanglement via Symmetry-Selective Bath Engineering in Superconducting Qubits.

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Bath engineering stabilizes entanglement between superconducting qubits using engineered symmetries. This approach efficiently creates specific quantum states and is scalable for future quantum technologies.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Engineering

Background:

  • Bath engineering offers an alternative to traditional quantum control methods.
  • It uses engineered dissipation to create desired quantum states.
  • Superconducting qubits are a leading platform for quantum computation.

Purpose of the Study:

  • To demonstrate entanglement stabilization in superconducting qubits via bath engineering.
  • To utilize engineered symmetries for selective state preparation.
  • To show suppression of unwanted entangled states.

Main Methods:

  • Engineered coupling to lossy modes in a superconducting circuit.
  • Utilized symmetry properties of the dissipative environment.
  • Implemented parity selection rules for state control.

Main Results:

  • Achieved dissipative stabilization of entanglement between two transmon qubits.
  • Demonstrated symmetry-selective stabilization of a target Bell state.
  • Showed suppression of an oppositely symmetric Bell state.
  • Reached a steady-state fidelity of F=0.70.

Conclusions:

  • Bath engineering provides a resource-efficient method for generating entangled states.
  • Engineered dissipation and symmetries offer precise control over quantum states.
  • The demonstrated technique is scalable to multi-qubit systems.