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Quantum limits on noise in linear amplifiers

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Establishes the fundamental added-noise limits for phase-insensitive and phase-sensitive linear amplifiers. In the high-gain phase-insensitive case, input-referred added noise is at least one-half quantum.

Key Results

  • Derives the half-quantum added-noise limit for high-gain phase-insensitive amplification
  • Distinguishes phase-insensitive from phase-sensitive quantum limits

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