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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Tunable electromagnetic environment for superconducting quantum bits.

P J Jones1, J A M Huhtamäki, J Salmilehto

  • 1QCD Labs, COMP Centre of Excellence, Department of Applied Physics, Aalto University, P.O. Box 13500, FI-00076 Aalto, Finland.

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|June 14, 2013
PubMed
Summary
This summary is machine-generated.

We developed a tunable quantum environment for circuit quantum electrodynamics experiments. This setup allows precise control over a qubit's interaction with its engineered thermal environment.

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Area of Science:

  • Circuit Quantum Electrodynamics
  • Quantum Engineering
  • Solid-State Physics

Background:

  • Circuit Quantum Electrodynamics (cQED) relies on precise control of quantum systems.
  • Engineered environments are crucial for manipulating qubit states and decoherence.

Purpose of the Study:

  • To introduce a novel, tunable engineered environment for cQED experiments.
  • To demonstrate control over qubit-environment coupling strength and temperature.

Main Methods:

  • Utilized a qubit in a high-quality-factor cavity capacitively coupled to a second cavity containing a controllable resistor.
  • Integrated superconducting quantum interference devices (SQUIDs) into the resistor cavity to tune coupling strength.
  • Varied the resistor temperature to create 'hot' or 'cold' qubit environments.

Main Results:

  • Achieved strong coupling for rapid qubit initialization.
  • Demonstrated tunable coupling by adjusting SQUID magnetic flux, allowing reduced interaction.
  • Showcased the ability to switch between strong and weak coupling regimes.

Conclusions:

  • The developed setup provides a versatile platform for studying open quantum systems in cQED.
  • This engineered environment enables precise control over qubit dynamics and decoherence.
  • The system allows for rapid initialization and subsequent free evolution of the qubit.