Entanglement-enhanced detection of single-photon scattering events

Abstract

The ability to detect the interaction of light and matter at the single-particle level is becoming increasingly important for many areas of science and technology. The absorption or emission of a photon on a narrow transition of a trapped ion can be detected with near unit probability, thereby enabling the realization of ultra-precise ion clocks and quantum information processing applications. Extending this sensitivity to broad transitions is challenging due to the difficulty of detecting the rapid photon scattering events in this case. Here, we demonstrate a technique to detect the scattering of a single photon on a broad optical transition with high sensitivity. Our approach is to use an entangled state to amplify the tiny momentum kick an ion receives upon scattering a photon. The method should find applications in spectroscopy of atomic and molecular ions and quantum information processing.

published version (including significant improvements compared to the previous preprints)

References in corpus (8)

• Quantum computing with trapped ions
• Deterministic entanglement of ions in thermal states of motion
• Challenges of laser-cooling molecular ions
• Precision Measurement Method for Branching Fractions of Excited P1/2 States Applied to 40Ca+
• Temperature-independent quantum logic for molecular spectroscopy
• Trapped-Ion State Detection through Coherent Motion
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Cited by in corpus (60)

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