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Energy relaxation time between macroscopic quantum levels in a superconducting persistent-current qubit.

Yang Yu1, D Nakada, Janice C Lee

  • 1Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|April 20, 2004
PubMed
Summary

Researchers measured energy relaxation times in a niobium (Nb) qubit, observing a multilevel decay process during microwave-driven transitions. This study estimates the decoherence time for superconducting qubits, crucial for quantum computing advancements.

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Information Science

Background:

  • Superconducting qubits are promising candidates for quantum computation.
  • Understanding energy relaxation and decoherence is critical for improving qubit performance.
  • Niobium (Nb) persistent-current qubits offer specific characteristics for quantum studies.

Purpose of the Study:

  • To measure the intrawell energy relaxation time (τ(d)) in a Nb persistent-current qubit.
  • To investigate population dynamics and decay processes during microwave-driven interwell transitions.
  • To estimate the decoherence time of the qubit system using the spin-boson model.

Main Methods:

  • Utilized a Nb persistent-current qubit with a double-well potential.
  • Employed microwave irradiation to induce interwell population transitions.
  • Measured intrawell energy relaxation time (τ(d) ≈ 24 μs).
  • Applied the spin-boson model to estimate decoherence time (≈ 20 μs).

Main Results:

  • Observed zero population in the initial well after driven transitions, indicating a multilevel decay process.
  • Quantified the intrawell energy relaxation time at approximately 24 microseconds.
  • Estimated the decoherence time to be around 20 microseconds for the studied Nb qubit configuration.

Conclusions:

  • The study successfully measured key relaxation and decoherence parameters in a Nb superconducting qubit.
  • Demonstrated a multilevel decay mechanism influencing qubit population dynamics.
  • Provides valuable insights into decoherence in superconducting qubits, relevant for quantum technology development.