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Conference on Lasers and Electro-Optics

Ramsey interferometry with photons

Stéphane Clemmen, Alessandro Farsi, Sven Ramelow, Alexander L. Gaeta

Published Jan 1, 2014• 0 citations
Publisher

Abstract

We demonstrate a photonic Ramsey interferometer using four-wave mixing in which the photon energies are analogous to atomic/molecular levels. This technique is highly promising for frequency-based quantum key distribution.
DOI
10.1364/cleo_qels.2014.fth5a.2

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Interferometry using discrete energy levels of nuclear, atomic, or molecular systems is the foundation for a wide range of physical phenomena and enables powerful techniques such as nuclear magnetic resonance, electron spin resonance, Ramsey-based spectroscopy, and laser or maser technology. It also plays a unique role in quantum information processing as qubits may be implemented as energy superposition states of simple quantum systems. Here, we demonstrate quantum interference involving energy states of single quanta of light. In full analogy to the energy levels of atoms or nuclear spins, we implement a Ramsey interferometer with single photons. We experimentally generate energy superposition states of a single photon and manipulate them with unitary transformations to realize arbitrary projective measurements. Our approach opens the path for frequency-encoded photonic qubits in quantum information processing and quantum communication.
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We present the experimental realisation of a cavity QED atom interferometer based on two consecutive resonant interactions of a circular Rydberg atom with the field mode of a high Q microwave resonator that is initially prepared in the vacuum state. The interferometer scheme is analogous to the Ramsey method with the classical field replaced by the quantum field stored in the cavity mode. We demonstrate the possibility to use this technique to probe, by dispersive interaction, the field stored in a second mode of the resonator.