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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Quantum two-level systems in Josephson junctions as naturally formed qubits.

A M Zagoskin1, S Ashhab, J R Johansson

  • 1Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama, Japan.

Physical Review Letters
|October 10, 2006
PubMed
Summary

Two-level systems (TLSs) in Josephson junctions can be used as qubits for quantum computing. This approach enables controlled initialization, quantum gates, and readout, offering a new path for superconducting quantum information processing.

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Information Science

Background:

  • Two-level systems (TLSs) in Josephson junctions are a significant challenge for superconducting phase qubit operation.
  • These TLSs exhibit long decoherence times, suggesting potential for quantum applications.

Purpose of the Study:

  • To investigate the feasibility of utilizing naturally occurring TLSs in Josephson junctions as qubits.
  • To demonstrate controlled initialization, universal quantum gates, and readout using these TLSs.
  • To explore the potential of a single Josephson junction as a multiqubit register.

Main Methods:

  • Theoretical analysis of two-level systems in Josephson junctions.
  • Modeling of qubit initialization, gate operations, and readout mechanisms.
  • Investigation of coupling mechanisms between Josephson junctions for multi-qubit operations.

Main Results:

  • Demonstrated that TLSs within Josephson junctions can function as qubits.
  • Showcased controlled initialization, universal quantum gate sets, and readout capabilities.
  • Established that a single current-biased Josephson junction can serve as a multiqubit register.
  • Proposed coupling mechanisms for applying quantum gates between arbitrary qubits.

Conclusions:

  • TLSs in Josephson junctions offer a viable alternative for realizing superconducting qubits.
  • This approach provides a novel pathway for superconducting quantum information processing.
  • Josephson junctions can be engineered as multiqubit systems for quantum computation.