Photon Added Detection

Abstract

The production of conditional quantum states and quantum operations based on the result of measurement is now seen as a key tool in quantum information and metrology. We propose a new type of photon number detector. It functions non-deterministically, but when successful, it has high fidelity. The detector, which makes use of an n-photon auxiliary Fock state and high efficiency Homodyne detection, allows a tunable tradeoff between fidelity and probability. By sacrificing probability of operation, an excellent approximation to a photon number detector is achieved.

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Cited by in corpus (5)

• Review article: Linear optical quantum computing
• Production of superpositions of coherent states in traveling optical fields with inefficient photon detection
• Preamplified photodetectors for high-fidelity postselecting optical devices
• Apply current exponential de Finetti theorem to realistic quantum key distribution
• Analysis for practical realization of number-state manipulation by number-sum Bell measurement with linear optics