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Related Experiment Videos

Creating decoherence-free subspaces using strong and fast pulses.

L-A Wu1, D A Lidar

  • 1Chemical Physics Theory Group, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada.

Physical Review Letters
|May 15, 2002
PubMed
Summary
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Strong and fast quantum control pulses create decoherence-free subspaces (DFSs) for scalable quantum computation. The Heisenberg exchange interaction alone can generate these pulses, enabling universal fault-tolerant quantum computing on DFSs.

Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Control

Background:

  • Decoherence-free subspaces (DFSs) are crucial for protecting quantum information from environmental noise.
  • Scalable and universal quantum computation requires robust methods for creating and maintaining DFSs.

Purpose of the Study:

  • To develop explicit pulse sequences for creating DFSs that support scalable quantum computation.
  • To investigate the role of the Heisenberg exchange interaction in generating these control pulses.

Main Methods:

  • Utilizing strong and fast "bang-bang" (BB) pulse sequences.
  • Generating BB pulses exclusively through the Heisenberg exchange interaction.
  • Focusing on conditions for collective decoherence where all particles interact identically with the environment.

Related Experiment Videos

Main Results:

  • Demonstrated explicit BB pulse sequences that create conditions for DFSs.
  • Showed that the Heisenberg exchange interaction is sufficient for generating these necessary BB pulses.
  • Established that these conditions enable scalable, universal quantum computation on DFSs.

Conclusions:

  • The Heisenberg exchange interaction is a fundamental resource for enabling universal fault-tolerant quantum computation on DFSs.
  • Explicit BB pulse sequences provide a viable pathway for robust quantum information processing.
  • This work advances the development of practical quantum computing architectures.