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Tunable coupling of superconducting qubits.

Alexandre Blais1, Alexander Maassen van den Brink, Alexandre M Zagoskin

  • 1Département de Physique and Centre de Recherche sur les Propriétés Electroniques de Matériaux Avancés, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1.

Physical Review Letters
|April 12, 2003
PubMed
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We demonstrate a tunable coupler for superconducting qubits using a current-biased Josephson junction. This method enables entanglement and facilitates two-qubit operations for advanced quantum computing architectures.

Area of Science:

  • Quantum Computing
  • Solid State Physics

Background:

  • Superconducting qubits are a leading platform for quantum computation.
  • Controlling qubit-qubit interactions is crucial for implementing multi-qubit gates.

Purpose of the Study:

  • To investigate the use of a current-biased Josephson junction (CBJJ) as a tunable coupler for superconducting qubits.
  • To demonstrate the implementation of two-qubit operations mediated by entanglement with the coupler.

Main Methods:

  • An LC circuit incorporating a CBJJ was designed and analyzed.
  • The bias current of the CBJJ was modulated to tune its resonance and entanglement with coupled qubits.
  • A recoupling scheme was developed to generalize the approach.

Main Results:

Related Experiment Videos

  • The CBJJ coupler can be tuned in and out of resonance with superconducting qubits.
  • Entanglement between the CBJJ and qubits was achieved, enabling mediated two-qubit operations.
  • The proposed scheme is applicable to various qubit designs, including charge-phase qubits.

Conclusions:

  • A CBJJ serves as an effective tunable coupler for superconducting qubits.
  • This approach provides a versatile method for implementing two-qubit gates.
  • The generalization allows for broader application in quantum circuit design.