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Protected Josephson Rhombus chains.

Matthew T Bell1, Joshua Paramanandam1, Lev B Ioffe2

  • 1Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.

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|May 13, 2014
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Researchers enhanced quantum circuit performance by protecting Josephson qubits. This protection significantly increased the qubit

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Area of Science:

  • Quantum computing
  • Solid-state physics
  • Circuit quantum electrodynamics

Background:

  • Josephson circuits are fundamental building blocks in quantum computing.
  • π-periodic Josephson elements offer unique properties but are sensitive to charge fluctuations.
  • Improving qubit coherence is crucial for advancing quantum technologies.

Purpose of the Study:

  • To investigate low-energy excitations in a minimalistic protected Josephson circuit.
  • To enhance qubit lifetime and quality factor through novel element design.
  • To demonstrate the practical application of symmetry protection in rhombus-based qubits.

Main Methods:

  • Studied a Josephson circuit with two π-periodic rhombus elements.
  • Employed a novel element design to minimize sensitivity to offset charge fluctuations.
  • Measured the lifetime (T1) and quality factor (ω01T1) of the first excited state.

Main Results:

  • Achieved a qubit lifetime (T1) of up to 70 μs in the protected regime.
  • Observed a ~100-fold increase in lifetime compared to the unprotected state.
  • Demonstrated a quality factor (ω01T1) exceeding 10^6.

Conclusions:

  • Symmetry protection is a feasible strategy for enhancing rhombus-based qubit performance.
  • The novel design effectively reduces sensitivity to charge noise.
  • Results align with theoretical predictions and show promise for existing fabrication technologies.