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Coherence-preserving quantum bits.

D Bacon1, K R Brown, K B Whaley

  • 1Department of Chemistry, University of California, Berkeley, California 94704, USA.

Physical Review Letters
|December 12, 2001
PubMed
Summary
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We developed a method to protect quantum information from decoherence by creating an energetically unfavorable environment for it. This approach encodes quantum data into a special ground state, making qubits robust against environmental noise.

Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Condensed Matter Physics

Background:

  • Quantum systems lose their quantum properties through decoherence, a process of environmental interaction.
  • Protecting quantum information from decoherence is crucial for building functional quantum computers.

Purpose of the Study:

  • To present a novel method for minimizing decoherence by making it energetically unfavorable.
  • To demonstrate a Hamiltonian that encodes quantum information in a decoherence-resistant manner.

Main Methods:

  • Designed a Hamiltonian using only two-body interactions among four qubits.
  • Engineered a 2-fold degenerate ground state where decoherence requires energy input from the environment.
  • Developed methods for universal manipulation of quantum information encoded in this ground state.

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Main Results:

  • The proposed Hamiltonian creates a ground state immune to local decoherence at low bath temperatures.
  • Any decoherence acting on individual qubits necessitates energy transfer from the bath to the system.
  • Demonstrated universal manipulation of quantum information stored in the degenerate ground state.

Conclusions:

  • This method offers a robust way to preserve quantum coherence by making decoherence energetically costly.
  • The approach is applicable to quantum dot systems, paving the way for more stable quantum computers.