Quantum information processing with Schrödinger cats

K. Nemoto, A. Gilchrist, W. J. Munro*, T. C. Ralph, S. L. Braunstein, G. J. Milburn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We investigate the utility of a superposition of coherent states for quantum information processing. We show that quantum computation circuits using coherent states as the logical qubits can be constructed from simple linear networks, conditional measurements and coherent superposition resource states. We can utilize such states and associated quantum circuits for two quantum metrology applications, one for weak force measurements and the second for precise phase estimation. We show in both cases that a sensitivity at the Heisenberg limit is achievable.

Original languageEnglish
Pages (from-to)434-443
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2003
Externally publishedYes


  • Quantum computation
  • Quantum information
  • Quantum metrology
  • Quantum optics
  • Schrödinger cats


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