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Binary projective measurement via linear optics and photon counting.

Masahiro Takeoka1, Masahide Sasaki, Norbert Lütkenhaus

  • 1Quantum Information Technology Group, National Institute of Information and Communications Technology (NICT), 4-2-1 Nukui-kitamachi, Koganei, Tokyo 184-8795, Japan.

Physical Review Letters
|August 16, 2006
PubMed
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We demonstrate perfect discrimination of two orthogonal quantum states using only linear optics and photon counting. This method is effective in the asymptotic limit with sufficient physical resources.

Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Linear Optics

Background:

  • Quantum state discrimination is fundamental in quantum information processing.
  • Implementing projective measurements with linear optics presents significant challenges.

Purpose of the Study:

  • To investigate the feasibility of binary projective measurements using linear optical components.
  • To demonstrate a method for perfect discrimination of orthogonal quantum states.

Main Methods:

  • Utilizing linear optics for quantum state manipulation.
  • Employing photon counting for measurement outcomes.
  • Incorporating coherent ancillary states and feedforward mechanisms.
  • Analysis in the asymptotic limit of large physical resources.

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Main Results:

  • Any two orthogonal pure quantum states can be perfectly discriminated.
  • The proposed method relies solely on linear optics, photon counting, and ancillary states.
  • Achieved perfect discrimination in the asymptotic limit.

Conclusions:

  • Linear optical implementations can achieve perfect discrimination of orthogonal quantum states.
  • The findings provide a pathway for robust quantum information processing with linear optics.