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Quantum Numbers02:43

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Published on: June 8, 2018

Quantum information storage using tunable flux qubits.

Matthias Steffen1, Frederico Brito, David DiVincenzo

  • 1IBM Watson Research Center, Yorktown Heights, NY 10598, USA. msteffe@us.ibm.com

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 10, 2011
PubMed
Summary
This summary is machine-generated.

We designed a superconducting quantum bit (qubit) coupled to a transmission line, achieving long quantum information storage. However, qubit energy lifetimes were unexpectedly short, suggesting potential issues with qubit size.

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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Information Science

Background:

  • Superconducting qubits are essential for quantum computing.
  • Coupling qubits to transmission lines enables quantum information storage.
  • Understanding qubit coherence limitations is critical for scalable quantum systems.

Purpose of the Study:

  • To investigate a tunable flux qubit strongly coupled to a transmission line.
  • To characterize quantum information storage and qubit coherence times.
  • To identify the cause of unexpectedly short qubit energy lifetimes.

Main Methods:

  • Fabrication of a tunable flux qubit design coupled to a transmission line.
  • Measurement of dephasing time (T2) for quantum information storage.
  • Measurement of energy lifetimes and coherence times.
  • Fabrication of standard flux qubits for comparison.

Main Results:

  • Demonstrated quantum information storage in the transmission line with a dephasing time of T2 ~ 2.5 µs.
  • Observed short qubit energy lifetimes (~10 ns), inconsistent with theoretical predictions.
  • Design and material modifications did not improve qubit coherence times.
  • Fabricated standard flux qubits showed improved coherence times, suggesting size-related losses.

Conclusions:

  • The designed qubit-transmission line system shows promise for quantum information storage.
  • Short qubit energy lifetimes are a significant challenge, potentially linked to qubit size.
  • Further investigation into loss mechanisms in larger superconducting qubits is warranted.