Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Quantum noise in the josephson charge qubit.

O Astafiev1, Yu A Pashkin, Y Nakamura

  • 1The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan. astf@frl.cl.nec.co.jp

Physical Review Letters
|February 9, 2005
PubMed
Summary

We investigated Josephson charge qubit decoherence using single-shot readout. Quantum noise causes spontaneous emission, dominating energy relaxation and impacting qubit performance.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Spectral properties of two superconducting artificial atoms coupled to a resonator in the ultrastrong coupling regime.

Nature communications·2025
Same author

Fast generation of Schrödinger cat states using a Kerr-tunable superconducting resonator.

Nature communications·2023
Same author

Hybrid rf SQUID qubit based on high kinetic inductance.

Scientific reports·2018
Same author

Tuneable on-demand single-photon source in the microwave range.

Nature communications·2016
Same author

Correlated Emission Lasing in Harmonic Oscillators Coupled via a Single Three-Level Artificial Atom.

Physical review letters·2015
Same author

Controllable microwave three-wave mixing via a single three-level superconducting quantum circuit.

Scientific reports·2014

Area of Science:

  • Quantum Computing
  • Solid State Physics
  • Superconductivity

Background:

  • Decoherence is a major obstacle in quantum computing.
  • Josephson charge qubits are promising candidates for quantum computation.
  • Understanding qubit decoherence mechanisms is crucial for improving qubit performance.

Purpose of the Study:

  • To investigate the decoherence mechanisms of a Josephson charge qubit.
  • To measure energy relaxation and dephasing rates.
  • To identify the dominant sources of noise affecting qubit stability.

Main Methods:

  • Utilized single-shot readout techniques for precise qubit state measurement.
  • Measured energy relaxation (T1) and dephasing (T2) times.
  • Analyzed the spectral density of quantum noise coupled to the qubit.

Related Experiment Videos

Main Results:

  • Identified spontaneous emission, driven by quantum noise, as the primary energy relaxation pathway.
  • Found that noise spectral density at high frequencies correlates with qubit excitation energy.
  • Quantified the impact of charge noise on qubit decoherence.

Conclusions:

  • Quantum noise coupled to the charge degree of freedom significantly limits Josephson charge qubit coherence.
  • Mitigating high-frequency charge noise is essential for advancing Josephson qubit technology.
  • The findings provide insights into qubit design and error correction strategies.