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Coherence-preserving quantum bits.

Publication ,  Journal Article
Bacon, D; Brown, KR; Whaley, KB
Published in: Physical review letters
December 2001

Real quantum systems couple to their environment and lose their intrinsic quantum nature through the process known as decoherence. Here we present a method for minimizing decoherence by making it energetically unfavorable. We present a Hamiltonian made up solely of two-body interactions between four two-level systems (qubits) which has a 2-fold degenerate ground state. This degenerate ground state has the property that any decoherence process acting on an individual physical qubit must supply energy from the bath to the system. Quantum information can be encoded into the degeneracy of the ground state and such coherence-preserving qubits will then be robust to local decoherence at low bath temperatures. We show how this quantum information can be universally manipulated and indicate how this approach may be applied to a quantum dot quantum computer.

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Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

December 2001

Volume

87

Issue

24

Start / End Page

247902

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

Citation

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Bacon, D., Brown, K. R., & Whaley, K. B. (2001). Coherence-preserving quantum bits. Physical Review Letters, 87(24), 247902. https://doi.org/10.1103/physrevlett.87.247902
Bacon, D., K. R. Brown, and K. B. Whaley. “Coherence-preserving quantum bits.Physical Review Letters 87, no. 24 (December 2001): 247902. https://doi.org/10.1103/physrevlett.87.247902.
Bacon D, Brown KR, Whaley KB. Coherence-preserving quantum bits. Physical review letters. 2001 Dec;87(24):247902.
Bacon, D., et al. “Coherence-preserving quantum bits.Physical Review Letters, vol. 87, no. 24, Dec. 2001, p. 247902. Epmc, doi:10.1103/physrevlett.87.247902.
Bacon D, Brown KR, Whaley KB. Coherence-preserving quantum bits. Physical review letters. 2001 Dec;87(24):247902.

Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

December 2001

Volume

87

Issue

24

Start / End Page

247902

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences